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: Biochemistry
[{'content': 'True about electron transport chaina) FADH gives 2 ATPb) Entry point of NADH is at complex IIc) NADH gives 3 ATPd) FADH gives 3 ATPe) NADH enters the step 1 of cycle \nSelect and explain. \nA. ace, B. bc, C. bcd, D. ae', 'role': 'user'}, {'content': 'Answer: A \nExplanation: NADH enters the step 1 of cycle > FA gives 2 ATP & NADH gives 3 ATP\n\nNADH enters the ETC at complex I and FADH2 enters the ETC at complex II.\nAccording to old calculations one molecule of NADH produces 3 ATPs and molecule of FADH2 produces 2 ATP molecules. However, in recent studies it has been proved that NADH produces 2.5 ATPs and FADH2 produces 1.5 ATP s.', 'role': 'assistant'}]