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
Drug transport mechanisms include:  a) Active transport b) Passive transport c) Lipid solubility d) Bioavailability e) Distribution 
Select and explain. 
A. ab, B. ae, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: None