Final answer:
The autobiography 'Gifted Hands: The Ben Carson Story' doesn't specify which celebrity visited Beth in her comatose state at Johns Hopkins Hospital.
Step-by-step explanation:
In the autobiography Gifted Hands: The Ben Carson Story, the celebrity who came to Johns Hopkins to visit Beth when she was comatose isn't explicitly mentioned. However, it is common for famous individuals to visit patients in hospitals to offer support and encouragement.
Since the book describes the various challenges faced by Dr. Ben Carson and his patients at Johns Hopkins Hospital, it's possible that the narrative mentioned a celebrity visit as part of the broader story of hope and recovery.