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
[{'content': 'Which of the component of respiratory chain reacts directly with molecular oxygen ? \nSelect and explain. \nA. Cyt b, B. CoQ, C. Cyt C, D. Cyt aa3', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Cyt aa3", 'role': 'assistant'}]