Conversation so far:
Where was Joshua Chamberlain born?
Joshua Chamberlain was born in Brewer, Maine.
Where did Joshua Chamberlain go to school?
Joshua Chamberlain entered Bowdoin College in Brunswick, Maine, in 1848 with the help of local tutor and professor, William Hyde.

Question: What did he study in college?
Self-contained rewrite: What did Joshua Chamberlain study in college?