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: Medicine
[{'content': 'Normal PQ interval is - \nSelect and explain. \nA. 0.12 sec., B. 0.2 sec., C. 0.16 sec., D. 0.016 sec.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]