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': 'In normal adult Vd/Vt ratio is: \nSelect and explain. \nA. 20, B. 0.35, C. 40, D. 50', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 0.35Vd = Dead space volume & Vt = Tidal Volume, so Vd/Vt = 150 = 0.3 100Normal value of Vd/Vt in adults = 0.2 - 0.35Q', 'role': 'assistant'}]