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
The best method for hemoglobin estimation is - 
Select and explain. 
A. Sahli's hemoglobinometer, B. Cyanmethemoglobin method, C. Calorimetric method, D. None of the above
B: Cyanmethemoglobin method
Answer: B: Cyanmethemoglobin method 
Explanation: None