This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood malignancies, Subject name: Pediatrics
[{'content': 'All of the following are true about neuroblastoma except? \nSelect and explain. \nA. Diarrhea, B. Bone pain, C. Cafe-au-lait spots, D. Opsomyoclonus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cafe au lait spots are associated with neurofibromatosis.', 'role': 'assistant'}]