Use reasoning to lead to the answer of the following question:
Test for natural language inference.\nPremise: "A man in a gray sweater and blue jeans instructing on a blackboard."\nHypothesis: "A teacher presents a lesson plan."\nIs the hypothesis entailed by the premise?\nOptions:\n- yes\n- no\n- it is not possible to tell

it is not possible to tell
A man instructing on a blackboard is not necessarily a teacher and it is not essential that he presents a lesson plan.

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The answer: it is not possible to tell