This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, 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 errorAcute hemolytic reaction resulting from ABO incompatibility is the most serious complication of blood transfusion.", 'role': 'assistant'}]