This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
The most effective medical treatment of nasal polypi is: 
Select and explain. 
A. Topical decongestant nasal drops, B. Anti-histaminic, C. Topical steroids, D. Non-steroid anti-inflammatory drugs (NSAIDs)
C: Topical steroids
Answer: C: Topical steroids 
Explanation: Topical corticosteroids cause regression of nasal polypi. Anti-histaminic do not help in regressing polypi. NSAIDs can actually lead to formation of nasal polypi.