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': 'Spleen develops from: \nSelect and explain. \nA. Foregut diveiculum, B. Dorsal mesogastrium, C. Pleuroperitoneal membrane, D. Septum transversum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dorsal mesogastrium', 'role': 'assistant'}]