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': "Developmentally stomodeum is separated from the pharynx dorsally by: \nSelect and explain. \nA. Pharyngeal arch, B. Buccopharyngeal membrane, C. Rathke's pouch, D. Mandibular process", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]