This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy, Subject name: Radiology
[{'content': 'Intra cavitary Radiotherapy is used for the treatment of \nSelect and explain. \nA. CA stomach, B. CA Cervix, C. CA Oesophagus, D. CA Renal cell', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e.Ca Cervix Intracavitary radiotherapy is a form of brachytherapy in which radiation source is placed inside the body cavity e.g. Vagina, cervical canal or uterine cavity.", 'role': 'assistant'}]