This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The upper lip is derived from \nSelect and explain. \nA. Maxillary prominence and mandibular prominence, B. Maxillary prominence and medial nasal prominence, C. Maxillary prominence and lateral nasal prominence, D. Mandibular prominence and medial nasal prominence', 'role': 'user'}, {'content': "Answer: B \nExplanation: The upper lip is formed by the fusion of two maxillary prominences with the two medial nasal prominences Ref : Langman's Medical Embryology 14e pg 295,298.", 'role': 'assistant'}]