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: Unknown
[{'content': 'Quantum of Radiation advocated at point B in carcinoma cervix? \nSelect and explain. \nA. 1000 cGy, B. 2000 cGy, C. 5000 cGy, D. 8000 cGy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans- C 5000 rads a. External beam via cobalt or linear accelerator & brachytherapy (e.g. Radium, cobalt or cesium) is used in the treatment of carcinoma cervix. b. The radium dosage is calculated with respect to the amount of irradiation received at 2 theoretical points a & b. c. Point A lies 2cm above & 2cm lateral to the base of the radium tube in the cervical canal. It approximates to the position in the pelvis where the uterine artery & ureter cross. d. Point B lies 3cm lateral to point a & roughly corresponds to the position of obturator nodes. e. 8000 rads is the dosage given to point A in cancer cervix. f. The Manchester method of radiotherapy for a ca cervix is a variation of the Stockholm technique & uses rubber avoids loaded with radium in a plate of the platinum boxes for the vaginal vault.', 'role': 'assistant'}]