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': 'In portal hypertension lower end of the oesophagus may show dilatation of veins. Which of the following veins drains into the portal vein from the lower end of the oesophagus? \nSelect and explain. \nA. Right gastric, B. Left gastric, C. Hemiazygos, D. Inferior phrenic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]