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: Anatomy
[{'content': 'Which of the following organs has the most permeable capillaries? \nSelect and explain. \nA. Brain, B. Posterior pituitary gland, C. Liver, D. Small intestine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]