In each of these questions, a sentence has been divided into four parts and marked a. b, c and d. One of these parts contains a mistake in grammar Idiom or syntax. Identify that part and mark it as the answer.

than any other boy in the class. When a comparison is instituted by means of a Comparative followed by than, the thing compared must be always excluded from the class of things with which it is compared, by using other or some such words.