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': 'Which of the following is not a congenital anomaly? \nSelect and explain. \nA. Amastia, B. Polymastia, C. Polythelia, D. Mastitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mastitis is an inflammation of breast tissue that sometimes involves an infection. The inflammation results in breast pain, swelling, warmth and redness. You might also have fever and chills. Mastitis most commonly affects women who are breast-feeding (lactation mastitis) . Ref - medscape.com', 'role': 'assistant'}]