A traveller to the town reaches a crossroad. Upon asking residents A, B and C for directions to a certain destination, he gets the following responses

A traveller to the town reaches a crossroad. Upon asking residents A, B and C for directions to a certain destination, he gets the following responses
(A)    Turn left                (B)    Do not turn left
(C)    Go straight
If only one among (A), (B) and (C) is truthful, the traveller