Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Aspirin is an inhibitor of the synthesis of: 
 Options:  <1> Sterols <2> Prostaglandins <3> Phosphoacylglycerides. <4> Arachidonic acid. <5> Glycerophospholipids.
