Bacillus Cal Mete Guerin (BCG) Vaccine is used against tuberculosis. This vaccine was first used medically in 1921. It is on the WHO’s list of essential medicines.

The Loess Plateau, also known as the Huangtu Plateau, is a 640,000 km2 (250,000 sq mi) plateau located around the Wei River valley and the southern half of the Ordos Loop of the Yellow River in central China.

The Battle of Plassey was a decisive victory of the British East India Company over the Nawab of Bengal and his French allies on 23 June 1757.

Prime Minister Jawaharlal Nehru appointed the States Reorganisation Commission in December 1953, with the remit to reorganise the Indian states. The new commission was headed by the retired Chief Justice of the Supreme Court, Fazal Ali; its other two members were H. N. Kunzru and K. M. Panikkar.

The remarkable Tehri Dam or Tehri Dam Reservoir is the highest dam in India and also one of the tallest in the world. The Tehri Dam is a multi-purpose rock and 260.5 meters (855 ft) earth-fill embankment dam build on the Bhagirathi River near Tehri Garhwal in Uttarakhand.

Hence, the correct option is (D).

The introduction of English Education was a significant event of Lord William Bentinck’s administration. He appointed a committee headed by Lord Macaulay to make recommendations for the promotion of education. In his report, Macaulay emphasized the promotion of European literature and science through the English medium to the people of India. This recommendation was wholeheartedly accepted by William Bentinck. The Government Resolution in 1835 made English the official and literary language of India. In the same year, William Bentinck laid the foundation of the Calcutta Medical College.

Hence, the correct option is (D).

Karl Landsteiner, an Austrian and American biologist and physician, first distinguished the main blood groups in 1900. He found out that the blood of two people under contact agglutinates, and in 1901 he found that this affect was due to contact of blood with blood serum. As a result he succeeded in identifying the three blood groups A, B and O.

The first Amendment Act to the Indian Constitution was made in the year 1951. It was moved by the them Prime Minister of India, Jawarharlal Nehru, on 10 May 1951 and enacted by Parliament on 18 June 1951. It provided against abuse of freedom of speed and expression.

Dambulla cave temple also known as the Golden Temple of Dambulla is a World Heritage Site located near Kandy in Sri Lanka. It is the largest and best-preserved cave temple complex in Sri Lanka. The temple has a total of 153 Buddha statues and four statues of gods and goddesses.

Nepali originated from the group of Pahari languages and is written in Devanagari script. The language also is a lot similar to Hindi, the official language of India, as it has been derived from Sanskrit. Nepali language, also called Gurkha, Gorkhali, Gurkhali, or Khaskura, member of the Pahari subgroup of the Indo-Aryan group of the Indo-Iranian division of the Indo-European languages. Nepali is spoken by more than 17 million people, mostly in Nepal and neighbouring parts of India.

Hence, the correct option is (A).