This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Sushila, 25 year old young lady presented with complaint of acute hirsuitism and hoarseness of voice. Which of the following should be the best investigation to be done for the diagnosis - 
Select and explain. 
A. Blood pregnenolone levels, B. Blood DHEA levels, C. 17-ketosteroids level, D. LH and FSH levels
B: Blood DHEA levels
Answer: B: Blood DHEA levels 
Explanation: Ans is option 2 Blood DHEA levels Ref Harrison 17/e p303 ( t 50.2)