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
In normal adult Vd/Vt ratio is: 
Select and explain. 
A. 20, B. 0.35, C. 40, D. 50
B: 0.35
Answer: B: 0.35 
Explanation: 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