Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: It doesn't say if the man went up before his friend.
 The question and answer:
Premise: "A male topless rock climber is climbing a rock face whilst attached to a safety harness."
Hypothesis: "A man is climbing a rock wall before his friend comes up."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
The answer is it is not possible to tell