Student: Premise: "An old man is talking to a boy and his parents are looking."
Hypothesis: "The old man is the boy's grandfather."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no.
Teacher: Let's think:
Every old man may not be a grandfather. A old man talking to a young boy doesn't mean he is his grandfather. So the final answer is it is not possible to tell.