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.

Q: canada : car. mainland : ?

A: boat
****
Q: spain : airplane. hospital : ?

A: ambulance
****
Q: hospital : ambulance. hotel : ?

A:
taxi
****