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
Energy is required in which transpo process across cell membrane 
Select and explain. 
A. Osmosis, B. Facilitated diffusion, C. Active transpo, D. Simple diffusion
C: Active transpo
Answer: C: 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)