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
In which stage of the syphilis, nose is involved commonly ? 
Select and explain. 
A. Primary, B. Secondary, C. Teiary, D. Equally involved in all stages
C: Teiary
Answer: C: Teiary 
Explanation: Ans. is 'c' i.e., Teiary Nasal syphilis Nasal syphilis may be : i) Acquired or ii) Congenital. Teiary stage in which nose is involved most commonly. There is formation of gumma followed by bony perforation of nasal septum. Bridge of the nose collapses causing a saddle deformity. Atrophic rhinitis may occur as a complication.