Q: If "Young men race each other in a marathon." does that mean that "People are competing in an olympic marathon."?
Options:
- yes
- it is not possible to tell
- no
A: Racing each other does not imply competing in an Olympic marathon.
The answer is it is not possible to tell.

Q: Premise: "A hiker carrying a backpack is walking past a waterfall."
Based on this premise, can we conclude that the hypothesis "The hiker tosses a penny into the waterfall." is true?
Options:
- yes
- it is not possible to tell
- no
A: A hiker walking past a waterfall not necessarily tosses a penny into the waterfall.
The answer is it is not possible to tell.

Q: Given the sentence "A person scales a rock." is it true that "A person climbs the rock wall."?
A: Scales a rock is a form of climbs the rock wall.
The answer is yes.

Q: If "A girl on a stationary bike posing in her bikini top and bottoms wearing fishnet stockings." does that mean that "A boy on a bike is doing tricks."?
Options:
- yes
- it is not possible to tell
- no
A:
Contrary pieces of information are the boy on a bike doing tricks as against the girl on a stationary bike only posing in her bikini.
The answer is no.