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': 'BRAF V600E mutationsare seen in all of the following except \nSelect and explain. \nA. Langherhan’s cell histiocytosis, B. Erdheim Chester disease, C. Ovarian carcinoma, D. Grade II astrocytoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: BRAF V600E (valine converting to glutamate at 600thposition)is seen in the following cancers\n\nLangerhan’s cell histiocytosis\nHairy cell leukemia\nMalignant melanoma\nPilocytic astrocytoma (WHO Grade I astrocytoma)\nOvarian carcinoma\nEndometrial carcinoma\nColorectal carcinoma\nPapillary carcinoma thyroid\nErdheim Chester disease', 'role': 'assistant'}]