Boy: This is a photo of my family.

Girl: Let me have a look. Who is he?

Boy: He is my father.

Girl: What does he do? Is he a policeman? He's tall and strong.

Boy: No. He's a doctor.

Girl: Is she your mother? What does she do?

Boy: Yes. She's a teacher. She's very nice.

Girl: Who is the girl? What does she do?

Boy: She is my sister. She's a nurse.

Girl: She's very beautiful.

My father is a _____.