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': "Best method for hemoglobin estimation is ? \nSelect and explain. \nA. Sahli's hemoglobinometer, B. Cyanmethaemoglobin method, C. Calorimetric method, D. None of the above", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Cyanmethoemoglobin method o The most reliable and accurate method is the cyanmethaemoglobin method employing drabkins solution and a spectrophotometer.", 'role': 'assistant'}]