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
Oxidation of a molecule involves: 
Select and explain. 
A. Gain of electron, B. Loss of electron, C. Gain of proton, D. Loss of proton
B: Loss of electron
Answer: B: Loss of electron 
Explanation: 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.