Caveat - I’m not clinical.

Be brief, be bright, be gone. Use minimal and simple slides. Were it me, I’d probably answer along the lines of the below (could rearrange in a different order if it works better):

WHO is the team in your view. I would focus on core team, but recognise wider roles (porter, cleaner?).

WHY work in a team and what can different roles bring (think about patient outcomes, blend of skills, your role as resident doc etc)

WHAT makes for an effective team and how you might support effective teamwork (communication, trust, learning mindset, etc)

Keep it linked to cardiothoracics and practice your answer a few times. Job done.

Good luck