John, on his way to a town, reaches a road junction, where he can turn left or right.
He knows that only one of the two roads leads to the street, but unfortunately, he does not know which one.
Fortunately, he sees two twin-brothers standing at the road junction, and he decides to ask them for directions.
John knows that one of the two brothers always tells the truth and the other one always lies.
Unfortunately, he does not know which one always tells the truth and which one always lies.
Then guys The Question......
How can he find out the way to the street by asking just one question to one of the two brothers? ??
It's so simple..