Who is the boy and who is the girl ?

  Puzzle :-

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?

Answer :-

they both lied(I said atleast )

if only one lied they would both be boys or both be girls.