Based on the context and the answer, generate a question. 

Context: He thanked Charlie , the driver , and hobbled into the locker room . The stale smells of sweat , old tape , wet carpet and Icy - Hot liniment assailed his nostrils , and he grinned at the familiarity of it . He looked around the room and his eyes lit on Jack 's locker . He made his way over to it and , just like Jack , everything was neat and in its place .

Answer:

Jack is a teammate of mine



How do I know Jack ?