Question. Context: Theodora "Teddy" Altman, M.D. is a fictional character from the ABC medical drama Grey's Anatomy, portrayed by actress Kim Raver. She was an attending cardiothoracic surgeon at Seattle Grace Mercy West Hospital, the fictional institution where the show is set. She leaves the show in the 8th-season finale after it is revealed that she has been offered a chief position with Army Medical Command, but has turned it down out of loyalty to Dr. Owen Hunt. In order to liberate her from the hospital where her husband died, Hunt fires her from Seattle Grace. Teddy returns for a few episodes in season 14.

Question: who is dr altman on grey's anatomy?
Answer. Kim Raver
What step-by-step reasoning justifies that answer?
Reasoning: The relevant sentence in the passage is: Theodora "Teddy" Altman, M.D. is a fictional character from the ABC medical drama Grey's Anatomy, portrayed by actress Kim Raver.