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
Trimethoprim acts by- 
Select and explain. 
A. Inhibiting DHFR, B. Inhibiting protein, C. Inhibiting cell wall, D. Inhibiting cell membrance
A: Inhibiting DHFR
Answer: A: Inhibiting DHFR 
Explanation: Ans is 'a' i.e., Inhibiting DHFR