This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Physiology
[{'content': 'When the HR is 72 beats per min, what would be the duration of cardiac cycle? \nSelect and explain. \nA. 445 ms, B. 1450 ms, C. 700 ms, D. 833 ms', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cardiac cycle: - 72 beats occur in - 60sec. 1 beat would occur in - 60/72 1 beat - 0.833 sec (~ 833 ms) (0.0139 minute per beat).', 'role': 'assistant'}]