human
Question: Mark Black is my good friend. He is English. He has a yellow bike. His bike number is 9075. His mother has a black car. The number is CA3566. His father has a black car, too. The number is CA3567. Black is Mark's  _  .

Choices:
A) color
B) first name
C) brother
D) family name
gpt
The correct answer is 1: first name.