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: Gynaecology & Obstetrics
[{'content': 'Which is the characteristic lesion of pregnancy? \nSelect and explain. \nA. Vitiligo, B. Pemphigus, C. Tinea, D. Chloasma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Chloasma', 'role': 'assistant'}]