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
Most impoant mechanism of drug transpo across cell membrane - 
Select and explain. 
A. Fltration, B. Active transpo, C. Passive diffusion, D. Facilitated diffusion
C: Passive diffusion
Answer: C: Passive diffusion 
Explanation: Ans. is 'c' i.e., Passive diffusion Passive diffusion is the most impoant mechanism of drug transfer across membrane.