Premise: "A boy stands on a rail with his arms outstretched."
Hypothesis: "A sad boy stands on a rail with his arms outstretched."
Do we know that the hypothesis entailed by the premise? Stream of thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Standing on a rail with outstretched arms does not indicate mood/emotion such a being sad.
Therefore, the answer is it is not possible to tell.