Conversation so far:
What was Sigmund Freud's early life like?
Sigmund Freud was born in Freiberg, then moved to Leipzig and Vienna. He was the eldest of eight children. His father was Jewish and 20 years older than Freud's mother
Where did Sigmund Freud receive his education?
In 1865, the nine-year-old Freud entered the Leopoldstädter Kommunal-Realgymnasium, a prominent high school.

Question: What did he study?
Self-contained rewrite: What did Sigmund Freud study?