This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kerbs Cycle, Subject name: Biochemistry
Which of the following is the products formed from alcohol but not the intermediates of TCA cycle/ glycolysis: (PGI Dec 2006) 
Select and explain. 
A. Acetaldehyde, B. Pyruvate, C. Lactate, D. Oxalate
A: Acetaldehyde
Answer: A: Acetaldehyde 
Explanation: Ans: A (Acetaldehyde) Acetaldehyde is formed from alcohol but it is not intermediate ofTCA cycleQ Malate & oxalate are intermediates in TCA cycle (Harper27th/14 7) whereas pyruvate & lactate are intermediates in glycolysisfHarper 27th/lS3)Ethanol + NADPH + H+ + O2 MEOS AcetaldehydeFig. Metabolic pathway of alcohol