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: Pathology
[{'content': 'A five-year-old child presents with chronic bed wetting and bilateral loose deciduous first molars. His mother  says that she want to drink of water several times during each night. Which of the following is the most likely diagnosis? \nSelect and explain. \nA. Hand-Schuller-Christian disease, B. Marble bone disease, C. Nieman-Pick disease, D. Polyostotic fibrous dysplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]