This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
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: Helium is used because it decreases the turbulence.