Conversation so far:
When was Chen Guangcheng born?
CANNOTANSWER.
Does he have any siblings?
Chen is the youngest of five brothers.
where did he go to school?
In 1989, at the age of 18, Chen began attending school as a grade one student at the Elementary School.
Is he married?
Chen met his wife, Yuan Weijing.
do they have children?
Their son, Chen Kerui, was born later that year.
DO they have any other children?
In 2005 they had a second child--a daughter named Chen Kesi--in violation of China's one-child policy.

Question: what did he study in school?
Self-contained rewrite: what did Chen Guangcheng study in school?