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
Apheresis is - 
Select and explain. 
A. Selective separation of components of blood, B. Preventing blood transfusion infections, C. Separation of platelets from plasma, D. Isolating organisms from mixed culture
A: Selective separation of components of blood
Answer: A: Selective separation of components of blood 
Explanation: Answer- A. Selective separation of components of bloodApheresis is the general technique of extracorporeal blood purification whereby one constituent is removed and the remainder is returned to the patient.