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': 'Poal vein is formed by union of: \nSelect and explain. \nA. SMV & SV, B. SMV & IMV, C. IMV & SV, D. IMV + Hepatic vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SMV & SV', 'role': 'assistant'}]