Which allergy has most number of students affected?
CREATE TABLE Has_allergy (Allergy VARCHAR)
SELECT Allergy FROM Has_allergy GROUP BY Allergy ORDER BY COUNT(*) DESC LIMIT 1
### Context: CREATE TABLE Has_allergy (Allergy VARCHAR) ### Question: Which allergy has most number of students affected? ### Answer: SELECT Allergy FROM Has_allergy GROUP BY Allergy ORDER BY COUNT(*) DESC LIMIT 1