The error is in part (C) of the sentence. Pronoun "you" is considered as plural and therefore, requires a plural verb. The use of "has" is incorrect here and should be replaced by "have".

There is an error in the part (2) of the sentence. Here, instead of “its”, “his” should come. "Its" is used for non-living things while for a person, we use him/her.

The error is in part (B) of the sentence. The noun "post" needs to be kept in singular form as there can be multiple vancancies but post will be only one for the professors.

The error is in part (A) of the sentence. Word ‘growing’ does not fit in this context instead ‘growth’ should come. ‘Growing’ is the present participle of ‘growth’ which means to undergo natural development by increasing in size and changing physically. And ‘growth’ is a noun which means the process of increasing in size.

The error is in part (B) of the sentence. The noun "chocolate" is uncountable and therefore, we cannot use article "a" with it. So, it should be removed from the sentence.

The error is in part (C) of the sentence. The correct usage of the phrase suggesting a taste for something is when it is paired with the appropriate preposition. If the verb used was interesting then the preposition in would be correct, but the verb used is taste. One usually develops a taste for something. The correct sentence would be, "Rama has no taste for classical music."

The error is in part (B) of the sentence. The tense used here is wrong. The correct form of the tense would be the past continuous tense. The complete sentence is "The patient died despite having received the best medical help."

The given sentence is grammatically correct. Hence, option D is the correct answer.

The error is in part (B) of the sentence. The use of preposition "to" with the verb "persist" is incorrect. "Persist" is usually followed by the preposition "in" and then it takes continuous form of verb (verb + ing). Therefore, the correct sentence would be:

He persisted in doing it in spite of my sincere advice.

The error is in part (A) of the sentence. It has been structured incorrectly. When we read the sentence, it gives us a sense that the mad dog was walking slowly in the park which is not the case actually. It was the person who was walking slowly in the park. Part (A) should be restructured as "while he was walking slowly in the park".