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 suited anticogulant for osmotic fragility test is - 
Select and explain. 
A. Heparin, B. EDTA, C. Trisodium citrate, D. Potassium oxalate
A: Heparin
Answer: A: Heparin 
Explanation: Ans. is 'a' i.e., Heparin