Leo: If "A motorcycle rider starts to sand up on the seat of his white motorcycle." does that mean that "The white motorcycle is stopped."?\nOptions:\n- yes\n- it is not possible to tell\n- no
Mei: OK, So, let's think first...
Me:
User
A rider can start to stand up on a motorcycle even if it isn't stopped and is in motion.
Thus, the answer is it is not possible to tell.
Assistant