This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Stain that is usedto detect myelin \nSelect and explain. \nA. Luxol fast blue, B. Methylene blue, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Luxol blue is used to stain myelin sheath Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 72,73', 'role': 'assistant'}]