user: Question: What is Chosen By, when Couple is Katee Shean Joshua Allen, and when Choreographer(s) is Nakul Dev Mahajan?
Columns: ['Couple', 'Style', 'Music', 'Choreographer(s)', 'Chosen by']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Katee Shean Joshua Allen', 'Bollywood', '"Dhoom Taana" from Om Shanti Om', 'Nakul Dev Mahajan', 'Nigel Lythgoe']
SQL:

assistant: SELECT "Chosen by" FROM "Table" WHERE "Couple" = 'Katee Shean Joshua Allen' AND "Choreographer(s)" = 'Nakul Dev Mahajan';