Direction: In the following questions, some part of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is the answer. If a sentence is free from error, then your answer is (4), i.e., No error.
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					 Solve the question according to given instruction.
 
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- One of the
 - most dangerous disease
 - is AIDS
 - No error
 
 
Correct Option: B
diseases will replace disease because – One of is followed by a Plural Noun.
Hence, most dangerous diseases is the right usage.