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
[{'content': 'Apheresis is - \nSelect and explain. \nA. Selective separation of components of blood, B. Preventing blood transfusion infections, C. Separation of platelets from plasma, D. Isolating organisms from mixed culture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]