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 cell organelle contains DNA \nSelect and explain. \nA. Mitochondrion, B. Golgi body, C. Endoplasmic reticulum, D. Centriole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]