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': 'Wrong statement is: \nSelect and explain. \nA. Mees line in Arsenic poisoning, B. Pterygium of nails in Lichen Planus, C. Oncholysis in Psoriasis, D. Koilonychia in Megaloblastic Anemia (B12 def.)', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Koilonychia in megaloblastic anemia (B12 def)', 'role': 'assistant'}]