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In the following 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.

A. It was the drug and not the disease

B. that killed him

C. he would have been alive today

D. if he did not take the drug

Please do not use chat terms. Example: avoid using "grt" instead of "great".