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: ENT
Nasal cycle is the cyclical alternate nasal blockage occurring: 
Select and explain. 
A. Every 6-12 hours, B. Every 4- 12 hours, C. Every 6-8 Hours, D. Every 12-24 hours
C: Every 6-8 Hours
Answer: C: Every 6-8 Hours 
Explanation: Ans. C every 6-8-hours Nasal cycle: The alternate opening and closing of each side of nose is called nasal cycle - Kayser first described nasal cycle in 1895 - There is rhythmic cyclical congestion and decongestion of nasal mucosa - Nasal cycle varies every 2Y2-4 hrs and is characteristic of an individual. Note The closest answer here is 6-8 hours, hence it is being marked as the correct answer.