This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Pathology
[{'content': 'Most common anterior mediastinal tumor? \nSelect and explain. \nA. Thymoma, B. Neurofibroma, C. Pericardial cyst, D. Bronchogenic cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: Bailey and Love, 26th edition, P 868Most common anterior mediastinum tumor is thymoma. Choice B is seen in posterior mediastinum. Choice C and D are found in middle mediastinum.', 'role': 'assistant'}]