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: Dental
[{'content': 'Hypopigmented lesions are seen in \nSelect and explain. \nA. Melasma, B. Lichen planus pigmentosus, C. Urticaria pigmentosa, D. Pityriasis alba', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In melasma brown / grey brown macular pigmentation with well defined scalloped margins. Pigmentation darkens on sun exposure.\nLichen planus produces hyper pigmented lesions.\nPityriasis Alba produces scaly hypo pigmented macules.', 'role': 'assistant'}]