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
Number of ATP molecules and NADH formed in each cycle of glycolysis? 
Select and explain. 
A. a) 4 ATP 2NADH, B. b) 2 ATP 2 NADH, C. c) 4 ATP 4 NADH, D. d) 2 ATP 4 NADH
A: a) 4 ATP 2NADH
Answer: A: a) 4 ATP 2NADH 
Explanation: - In glycoslysis 4 ATPs are produced in which 2 ATPs are utilized so a net gain of 2 ATPs 2 NADH molecules are produced.