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: Unknown
[{'content': 'Regarding pituitary – false is \nSelect and explain. \nA. 2cm in diameter, B. Receives blood supply from circle of Willis, C. Entirely ectodermal in origin, D. Connected to thalamus by infundibulum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]