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
Majority of drugs are transported across the membrane by 
Select and explain. 
A. Passive diffusion, B. Active transport, C. Facilitated transport, D. Filtration
A: Passive diffusion
Answer: A: Passive diffusion 
Explanation: None