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': "Blaschko's lines refers to lines of: \nSelect and explain. \nA. Melanocyte migration, B. Ectodermal cell migration, C. Mesodermal cell migration, D. Endodermal cell migration", 'role': 'user'}, {'content': "Answer: B \nExplanation: Blaschko's lines are characteristic of mosaic conditions of the epidermis and probably represent the routes of ectodermal cell migration from the neural crest. Ref: Rook's textbook of dermatology, 8th edition, Pg 18.4.", 'role': 'assistant'}]