Funso (Chichewa): Ndi nthawi ziti zodziwika bwino zomwe zinalembedwa ku Nkhotakota?
Question (English): How many distinct time periods are recorded for Nkhotakota?
Table: food_insecurity (difficulty: medium)
SQL: SELECT COUNT(DISTINCT time_period) FROM food_insecurity WHERE district = 'Nkhotakota';
Result: [(2,)]