Conversation so far:
Where was Aleksandr Solzhenitsyn born ?
Aleksandr Solzhenitsyn was born in Kislovodsk, RSFSR (now in Stavropol Krai, Russia).
What was the name of Aleksandr Solzhenitsyn's father ?
Isaakiy Semyonovich Solzhenitsyn
What was the name of Aleksandr Solzhenitsyn's mother ?
Taisiya Zakharovna
Where did Aleksandr Solzhenitsyn go to school ?
Rostov State University.

Question: What did he study in that University ?
Self-contained rewrite: What did Aleksandr Solzhenitsyn study in that University ?