听力原文：Dr. Green is a pediatric dentist. Most of his patients are children. Children like to come to his office. He tells them about their teeth. He cleans their teeth well. He also takes care of their toothaches and fixes their broken teeth. Then he gives them a small gift.
Dr. Green lives in Olney. That's a small town near Washington,@D@C.. But his dental office is in Washington at 1616 Jefferson Street. He gets up at 6:15 every morning. He eats breakfast at 6:45 and leaves for work at 7:15. He drives to work and keeps his car in a parking lot on Madison Street. He gets to his office at about 8:00.
Dentists earn a lot of money, and they also have a lot of responsibilities.
What is Dr. Green？

A psychiatrist.
B. A pediatric dentist.
C. A paediatrician.