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: Physiology
[{'content': "Stimulus for Hering - Breuer's reflex of Respiration is \nSelect and explain. \nA. Tidal volume > 1000 ml, B. Tidal volume > 500 ml, C. Tidal volume < 500 ml, D. Tidal volume < 1000 ml", 'role': 'user'}, {'content': "Answer: A \nExplanation: Stimulus for hering - Breuer's reflex is, when tidal volume increase 2 times more than normal i.e, Tidal volume > 1000 ml.", 'role': 'assistant'}]