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': 'Middle deft upper lip due to failure of fusion b/w \nSelect and explain. \nA. Maxillary process, B. Medial naral process, C. Medial and lateral naral process, D. Medial naral process and maxillary process', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Defect\nCaused by\n\n\nCleft upper lip\nFailure of fusion between maxillary process and medial naral process\n\n\nMedial deft upper lip\nFailure of fusion between maxillay process and medial and lateral naral process\n\n\nOblique facial deft\nFailure of fusion between maxillary process and medial lateral naral process\n\n\nLower lip deft\nFailure of fusion of two mandibular process', 'role': 'assistant'}]