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
Anticoagulant of choice for ESR by Wintrobes method -a)  Citrateb)  Heparinc)  Oxalated)  EDTA 
Select and explain. 
A. ab, B. cd, C. bd, D. ac
B: cd
Answer: B: cd 
Explanation: Anticoagulant of choice for ESR by  
	Wintrobes method  → Double oxalate & EDTA
	Westergren method → Sodium citrate