This seems like a straightforward question with only one right answer, but the question is engineered to reveal your attitude through your choice of words. Simply saying yes and saying you are a team player does not communicate that you embrace a collaborative team mentality. Sharing your team mentality through your philosophy towards innovation through collaboration communicates to the interviewer your understanding of the big-picture of this question.

Focus on how every aspect of a business is a team effort. Even when someone's job is a solitary endeavor, that one person's efforts can affect the outcome of other departments. Most companies have a brand, and most brands foster a brand culture in their work environment. Every person in that environment is part of one team, whether they actively work with others or not.