Because if he drank the milk, he'd know that he's lactose intolerant. Ask him, then treat him for allergic reaction. If he gets better, we all get to go home early.
How can you be sure?
[SEP] How can you be sure? [SEP] Because if he drank the milk, he'd know that he's lactose intolerant. Ask him, then treat him for allergic reaction. If he gets better, we all get to go home early.