Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: A man and a woman differ in gender. A person who sits on a wall can't be walking a dog.
 The question and answer:
If "Man with black jacket sits on wall and overlooks river." does that mean that "A woman is walking her dog."?
Options:
- yes
- it is not possible to tell
- no
The answer is no