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: Skin
[{'content': 'Which of the following is an X-linked dominant condition presenting as hyperpigmented lesions along lines of Blaschko? \nSelect and explain. \nA. Incontinentia pigmenti, B. Hypomelanosis of Ito, C. LEOPARD syndrome, D. Pseudoxanthoma elasticum', 'role': 'user'}, {'content': "Answer: A \nExplanation: X-linked dominant trait due to mutation in NEMO gene presents as 4 distinct clinical stage in girls. Stage 1: inflammatory macules, papules, vesicles and pustules Stage 2: hyperkeratotic and verrucous lesions Stage 3: grey-brown pigmentation Stage 4: atrophic, hypopigmented and depigmented bands Ref: Rook's textbook of dermatology, 8th edition, Pg 58.16.", 'role': 'assistant'}]