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
More resistance in expiration is due to: 
Select and explain. 
A. Increased compression of airway, B. Due to change from linear to turbulent flow, C. Saturation with moisture, D. Increased rate of flow during expiration
A: Increased compression of airway
Answer: A: Increased compression of airway 
Explanation: A i.e. Increased compression of airways