Use reasoning to lead to the answer of the following question:
Sam spent most of his time standing up. His job was hectic and he never got any rest. But he was the best cashier at his workplace.  Where might he work?\nOptions:\n- bookstore\n- count till\n- supermarket\n- shop\n- preschool
 Reasoning process:
User
Supermarket has cashiers. Workers in a supermarket spend most of their time standing up. Workers of a supermarket do not get any rest. Supermarket is a building. Therefore, the final answer is supermarket.
Assistant