user: Question: When hot adult contemporary is the format what is the call sign?
Columns: ['Frequency', 'Call sign', 'Branding', 'Format', 'Owner', 'Language/Rebroadcast']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['FM 93.7', 'CJLT-FM', '93.7 Praise FM', 'Contemporary Christian music', 'Vista Radio', 'English']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "Format" = 'hot adult contemporary';