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
Which of the following reaction is due to lipid peroxidation ? 
Select and explain. 
A. Saponification, B. Rancidity, C. Hydrogenation, D. Soap formation
B: Rancidity
Answer: B: Rancidity 
Explanation: Ans. is 'b' i.e., Rancidity Peroxidation (auto-oxidation) of lipids exposed to oxygen is responsible not only for deterioration of foods (rancidity) but also for damage to tissues in vivo. Lipid peroxidation is a chain of reaction generating free radicals that initiate fuher peroxidation.