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: Medicine
You have to draw blood from a patient. When will you
give EDTA? 
Select and explain. 
A. Orally starting several days before, B. Through I.V. route before drawing blood, C. EDTA is not an anticoagulant, D. EDTA will be added in test tube
D: EDTA will be added in test tube
Answer: D: EDTA will be added in test tube 
Explanation: None