This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'Van nuys prognostic index is not based on: \nSelect and explain. \nA. Age, B. Microcalcification, C. Size, D. ER status', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The Van Nuys Prognostic Index is based on size & grade of DCIS, margins and age of patient. Van Nuys Prognostic Index Parameter Score 1 Score 2 Score 3 Van Nuys Classification Group 1 Group 2 Group 3 Non high nuclear grade without necrosis Non High nuclear grade with necrosis High nuclear grade with or without necrosis Margins >=10 mm 1-9 mm <1 mm Size <15 mm 16-40 mm >40 mm Age >60 40-60 <40 REF : BAEILY AND LOVE 27TH ED', 'role': 'assistant'}]