<prompt> Nasal polyps develop in patients with:Aspirin intoleranceFungal sinusitisChronic rhinosinusitis of non-allergic originAll of the above  <response>: Aetiology of nasal polyp formation is not well-understood. They are seen in:i. Aspirin intoleranceii. Allergic fungal sinusitisiii. Chronic rhinosinusitis of both allergic and non-allergic originiv. Cystic fibrosisv. Disorders of ciliary motilityvi. Churg-Strauss syndrome asthma, fever, vasculitis and granuloma. 