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: Medicine
[{'content': 'A female developed brown macule on the cheek, forehead and nose after exposure to light following delivery of a baby, the diagnosis is - \nSelect and explain. \nA. SLE, B. Chloasma, C. Photodermatitis, D. Acne rosacea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]