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
A female developed brown macule on the cheek, forehead and nose after exposure to light following delivery of a baby, the diagnosis is - 
Select and explain. 
A. SLE, B. Chloasma, C. Photodermatitis, D. Acne rosacea
B: Chloasma
Answer: B: Chloasma 
Explanation: None