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
Kali Rani a 20yr old girl presents with history of rapidly developing hirsutism and amenorrhea. To establish the diagnosis you would like to proceed with which of the following tests in blood : 
Select and explain. 
A. 17 - OH progesterone, B. DHEA, C. Testosterone, D. LH : FSH ratio
C: Testosterone
Answer: C: Testosterone 
Explanation: Ans. is c i.e. Testosterone