This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Photosensitive disorders, Subject name: Dental
Brown macular pigmentation in malar area in a pregnant female is due to - 
Select and explain. 
A. Acne rosacea, B. Cholasma, C. Acanthosis nigricans, D. Uicaric pigmentosa
B: Cholasma
Answer: B: Cholasma 
Explanation: Brown macular pigmentations over malar area is characteristic of melasma. maily effects the sun exposed areas like forehead cheeks temples and upper lip. melasma in pregnancy is called chloasma. This occurs due to hormonal changes and increased with exposure to sunlight. Iadvl textbook of dermatology , page 781