Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: The two activities are mutually exclusive- a dentist working on a patient is not likely singing to a crowd at the same time.
 The question and answer:
Given the sentence "A woman sings to a group of people holding their hands up." can we conclude that "A dentist is working on a patient."?
Options:
- yes
- it is not possible to tell
- no
The answer is no