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': 'Which of the following is a true cyst? \nSelect and explain. \nA. Aneurysmal bone cyst, B. Gingival cyst of the newborn, C. Haemorrhagic bone cyst, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]