Conversation so far:
Where was Tu youyou born?
Tu youyou was born in Ningbo, Zhejiang, China
When was tu youyou born?
Tu youyou was born on 30 December 1930
Where did Tu youyou do her university studying?
Tu youyou attended Peking University Medical School / Beijing Medical College.
Are there any interesting facts you can tell me about tu youyou?
After graduation, Tu youyou worked at the Academy of Traditional Chinese Medicine in Beijing
What kind of work did tuyouyou do at the traditional medicine academy?
Tu youyou did research

Question: What did she primarily research?
Self-contained rewrite: What did Tuyouyou primarily research?