Which of the three molecules aspirin, paracetamol and ibuprofen contains a carboxyl group?

Name: Which of the three molecules aspirin, paracetamol and ibuprofen contains a carboxyl group?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

A carboxyl group contains a -COOH functional group. 
Aspirin contains a carboxyl group (-COOH) 
Paracetamol does not contain a carboxyl group. 
Ibuprofen contains a carboxyl group (-COOH). 
Therefore, only aspirin and ibuprofen contain carboxyl groups, making the correct choice B.

Which of the Three Molecules Aspirin, Paracetamol and Ibuprofen Contains