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': 'Reticulocytes are stained with \nSelect and explain. \nA. Methyl violet, B. Brilliant Cresyl blue, C. Sudan black, D. Indigo carmine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Reticulocytes are stained in living state in vitro so staining with dyes like brilliant cresyl blue and new methylene blue is referred to as supravital staining.', 'role': 'assistant'}]