The relationship between Marketing and Sales is known for its unrest (Sales wants better leads from Marketing, and Marketing wants Sales to close more, faster).

"Marketers are the lead generators and salespeople are the lead closers" isn't necessarily wrong, but the candidate who ends his/her answer here might not be someone who can align both departments around a single, unified approach.

The best answers describe the responsibilities that Sales and Marketing have to each other, and the duties each commits to as part of this partnership. They have a plan for forging consensus on what makes leads marketing-qualified versus sales-qualified, creating a shared Service Level Agreement with agreed-upon metrics, and using content at different points in the marketing and sales funnel to turn strangers into customers.