The fact that a man in a black shirt and gray hat gives the thumbs up to a crowd with one hand, while holding a microphone in the other does not imply that a man is giving a lecture to a crowd.


Context: A man in a black shirt and gray hat gives the thumbs up to a crowd with one hand, while holding a microphone in the other.
Hypothesis: A man is giving a lecture to a crowd.

Given this context, determine if the hypothesis is true (Yes, no, or unknown)?