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: Surgery
[{'content': 'Cyst showing cholesterol crystals is/are: \nSelect and explain. \nA. Branchial cyst., B. Dentigerous cyst., C. Old hydrocele., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cysts showing cholesterol crystals are:\n\nBranchial cyst\nDental cyst\nDentigerous cyst\nCystic Hygroma (not always)\nOld hydrocele\nThyroglossal cyst (not always)', 'role': 'assistant'}]