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: Anaesthesia
In a patient with fixed respiratory obstruction Helium is used along with Oxygen instead of plain oxygen because 
Select and explain. 
A. It increases the absorption of oxygen, B. It decreases turbulence, C. It decreases the dead space, D. For analgesia
B: It decreases turbulence
Answer: B: It decreases turbulence 
Explanation: B i.e. It decreases turbulence