Who's lying?

A boy and a girl are talking.

"I am a boy" - said the child with black hair.

"I am a girl" - said the child with white hair.

At least one of them lied. Who is the boy and who is the girl?


Ans:

Both of them are lying! If any one of them is lying, both of them would be either boy of girl which is not as the condition stated at the beginning.