Answer:
Passing off someone else's work as your own is not ethical or professional behavior. It undermines the hard work and contributions of the team member who actually created the presentation and can damage their morale and trust in the manager.
If you are the team member whose presentation was taken credit for, it is important to address the situation with the manager in a professional manner. You can start by asking for clarification about the presentation and expressing your concern that the manager took credit for your work. It is possible that the manager may have had a genuine misunderstanding, but if it was intentional, it is important to express how this behavior makes you feel and why it is not acceptable.