This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Chain, Subject name: Biochemistry
[{'content': 'Oxidation of a molecule involves: \nSelect and explain. \nA. Gain of electron, B. Loss of electron, C. Gain of proton, D. Loss of proton', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Loss of electrona. Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.b. Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.', 'role': 'assistant'}]