This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
A 16 year old girl with blind vagina and absent uterus presents to you. The investigation you will like to do first is : 
Select and explain. 
A. Intravenous pyelography, B. FSH, C. Karyotyping, D. CT scan of pelvis
C: Karyotyping
Answer: C: Karyotyping 
Explanation: Karyotyping