user: Question: What is Couple, 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 "Couple" FROM "Table" WHERE "Choreographer(s)" = 'Nakul Dev Mahajan';