This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic & Reconstructive Surgery, Subject name: Surgery
[{'content': 'Lines of Blaschko represent: \nSelect and explain. \nA. Lines along lymphatics, B. Lines along blood vessels, C. Lines nerves, D. Lines of development', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) Lines of developmentBlaschko's lines reflect cell migration during embryogenesis of the skin. Nevi cluster along these lines", 'role': 'assistant'}]