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
[{'content': 'Most common cause for complication of blood transfusion is? \nSelect and explain. \nA. Human error, B. Anaphylaxis, C. GVHD, D. Presensitisation', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Human error The most common cause resulting in complications from blood transfusion is human error Acute hemolytic reaction resulting from ABO incompatibility is the most serious complication of blood transfusion.", 'role': 'assistant'}]