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
[{'content': 'Point B in treatment of Ca Cervix by radiotherapy corresponds to: \nSelect and explain. \nA. Ohturator nodes, B. Mackenrodts ligament, C. Ischia] tuberosity, D. Round ligament', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Ohturator nodes', 'role': 'assistant'}]