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: Pathology
[{'content': 'Neurological symptoms and premature graying of hair is\nassociated with: \nSelect and explain. \nA. Folic acid deficiency, B. Pernicious anaemia, C. Plummer-Vinson syndrome, D. Paterson-Kelly syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]