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': 'Diaphragm develops from all except - \nSelect and explain. \nA. Septum transversum, B. Dorsal mesocardium, C. Pleuroperitoneal membrane, D. Cervical myotomes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]