Given the following reasoning and answer, what was the question? The boy doesn't have to be doing tricks or practicing for a competition.
 The answer: it is not possible to tell
The question Test for natural language inference.
Premise: "A teenage boy grinds across a bar on his skateboard."
Hypothesis: "A boy is performing tricks on his skateboard for a competition."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell