Two analogies that relate places/locations to the associated travel mode is given in the form "A : B. C : ?". "A : B" relates place A to travel mode B. Your task is to replace the question mark (?) with the appropriate travel mode for the given place C, following the "A : B" relation.

theater : car. hospital : ?
ambulance

mall : bus. downtown : ?
subway

school : skateboard. canada : ?

car