This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
In low dose aspirin acts on : 
Select and explain. 
A. Cyclooxygenase, B. Thromboxane A, synthase, C. PGI2 synthase, D. Lipoxygenase
A: Cyclooxygenase
Answer: A: Cyclooxygenase 
Explanation: None