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: Radiology
[{'content': 'In X-ray, jejunum has a pattern of: \nSelect and explain. \nA. Valvulae connivantes, B. Taenia coli, C. Reverse 3 sign, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Valvulae connivantes', 'role': 'assistant'}]