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
[{'content': 'The most effective medical treatment of nasal polypi is: \nSelect and explain. \nA. Topical decongestant nasal drops, B. Anti-histaminic, C. Topical steroids, D. Non-steroid anti-inflammatory drugs (NSAIDs)', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Topical corticosteroids cause regression of nasal polypi. Anti-histaminic do not help in regressing polypi. NSAIDs can actually lead to formation of nasal polypi.', 'role': 'assistant'}]