Katherine Choi loved building the 91吃瓜网 College of Medicine as a student. So when a leader of 91吃瓜网鈥檚 new partnership obstetrics and gynecology residency talked to Choi about building its new program, her reaction was swift and certain: 鈥淟et鈥檚 do this.鈥� On Friday, Choi got the opportunity, matching into an OB-GYN specialty at North Florida Regional Medical Center in Gainesville,…