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: Surgery
[{'content': "The commonest presentation of meckel's diverticulum is - \nSelect and explain. \nA. Bleeding, B. Obstruction, C. Diverticulitis, D. Intussception", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]