The young man is either wearing Elmo or Slayer on his t-shirt, not both, and he can not be riding both a bike and a skateboard. Skateboarding is also not an activity performed in the woods.


Context: A young man in an Elmo t-shirt is flying through the air on a mountain bike in the woods.
Hypothesis: A young man in a Slayer t-shirt is flying through the air on his skateboard in the woods

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