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: Pathology
[{'content': 'Melanin pigmentation in pregnancy is known as \nSelect and explain. \nA. Melasma, B. Melanoma, C. Epulis, D. Melanosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]