This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gaseous exchange, Subject name: Physiology
[{'content': 'Assuming a respiratory rate of 12 breaths/min, calculate the minute ventilation. \nSelect and explain. \nA. 1 L/min, B. 2 L/min, C. 4 L/min, D. 6 L/min', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Minute ventilation is VT x respiratory rate. VT from the graph is 500 milliliters. Therefore, minute ventilation = 500 x 12 = 6 L/min', 'role': 'assistant'}]