Nasal cycle is the cyclical alternate nasal blockage occurring:

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.