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: Radiology
[{'content': 'Which of the following is the most common cause of a mixed cystic and solid suprasellar mass seen on cranial MR scan of a 10 years old child: \nSelect and explain. \nA. Pituitary Adenoma, B. Craniopharyngioma, C. Optic chiasma glioma, D. Germinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Craniopharyngioma', 'role': 'assistant'}]