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': 'Poocaval anustomoses is seen at ? \nSelect and explain. \nA. Esophagus, B. Stomach, C. Duodenum, D. Jejunum', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Esophagus", 'role': 'assistant'}]