This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Drug transpo process that requires energy 
Select and explain. 
A. Active transpo, B. Passive diffusion, C. Conventive current, D. Pinocytosis
A: Active transpo
Answer: A: Active transpo 
Explanation: The passage of substances against their electrical and chemical gradient at the expenditure of energy is called active transpo. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 6)