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
FADH2 enters ETC via which complex? 
Select and explain. 
A. Complex I, B. Complex II, C. Complex III, D. Complex IV
B: Complex II
Answer: B: Complex II 
Explanation: FADH2 enters ETC via Complex II (Succinate Q Reductase) and hence generates only 1.5 molecules of ATP. (NADH generates 2.5 ATPs)