This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Gynaecology, Subject name: Gynaecology & Obstetrics
Sentinel lymph node biopsy is done in all except: 
Select and explain. 
A. Ca vulva, B. Ca cervix, C. Ca breast, D. Choriocarcinoma
D: Choriocarcinoma
Answer: D: Choriocarcinoma 
Explanation: Ref: Dm to Textbook of Gynecology 5th ed pg.328Explanation:Sentinel lymph node is the first node that drains the primary tumourIn most cases there is a single sentinel lymph nodeThis node can be detected by intraoperative lymphatic mapping injecting methylene blue dye into the tumour or lymphoscintigraphy using technitium 99Uses in Gynecologic MalignancyCervical CaCa VulvaCa Endometrium