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: Radiology
Point B in treatment of Ca Cervix by radiotherapy corresponds to - 
Select and explain. 
A. Obturator nodes, B. Machenrodt's ligament, C. Ischial tuberosity, D. Round ligament
A: Obturator nodes
Answer: A: Obturator nodes 
Explanation: None