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': 'Which embryonic structure forms philtrum of upper lip \nSelect and explain. \nA. Maxillary process, B. Mandibular process., C. Medial nasal process., D. Lateral nasal process.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]