A quiz

[ابو نور]

There was a man walking in the street.
At the end, there was a right turn and a left one.
In one of them, there was a mosque which he wanted to go to,
but he didn't know where it was.
He went to a villa. In this villa there were two girls.
One of them told the truth and the other was lier.
He knocked the door, one of them opened.
He did not know which one she was.

He asked her a question only. Through this question , he could go to the mosque.


What was the question?