This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Umblicial cord and diaphragm, Subject name: Anatomy
[{'content': "A patient presented with midline pain at the marked dermatome (shaded in green). Select the best possible answer, as a differential diagnosis \nSelect and explain. \nA. Angina pectoris, B. Meckel's diveiculum, C. Acute cholecystitis, D. Renal colic", 'role': 'user'}, {'content': "Answer: B \nExplanation: The green shaded area is the umbilical region, carrying T10 dermatome. Referred pain of mid-gut derivatives is felt in the peri-umbilical region (T - 10). Meckel's diveiculum is a mid-gut anomaly, presenting with pain around the umbilicus.", 'role': 'assistant'}]