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
Best method for hemoglobin estimation is ? 
Select and explain. 
A. Sahli's hemoglobinometer, B. Cyanmethaemoglobin method, C. Calorimetric method, D. None of the above
B: Cyanmethaemoglobin method
Answer: B: Cyanmethaemoglobin method 
Explanation: Ans. is 'b' i.e., Cyanmethoemoglobin method o The most reliable and accurate method is the cyanmethaemoglobin method employing drabkins solution and a spectrophotometer.