This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Most common liver tumor in children \nSelect and explain. \nA. Hemangioma, B. Non-parasitic cyst, C. Adenoma, D. Focal nodular hyperplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]