A male and a female person are sitting on the bench "I'm a male', says the person with brown hair " I'm a female says the person with black hair. if atleast one of them is lying, who is male and who is female

(Atleast) one means one or more than one

Explanation:

A simple analysis shows that the persons either have to be both lying or both telling the truth. Since we are told that at least one of them is lying, the person with brown hair is the female person and the person with black hair is the male person.

the person with the black hair is male and the person with the brown hair is female.