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 cotrimoxazole, sulphamethoxazole and trimethoprim are in the ratio of- 
Select and explain. 
A. 2:01, B. 1:01, C. 5:01, D. 1:05
C: 5:01
Answer: C: 5:01 
Explanation: Ans. is 'c' i.e., 5 : 1 o Optimal synergy in case of most organism is exhibited at a concentration ratio of Sulphamethoxazole 20: Trimethoprim 1 (This ratio is obtained in plasma when two are given in a dose ratio of 5:1).