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: Surgery
[{'content': "Testing of receipient cells against donor serum is \nSelect and explain. \nA. Major Cross Matching, B. Minor Crossmatching, C. Direct Coomb's Test, D. Rh Group Matching", 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer- B. Minor CrossmatchingMinor cross-match: Recipient red cells are tested against donor serum to detect donor antibodies directed against a patient's antigens.This is no longer required. It is assumed that the small amount of donor serum and antibodies left in a unit of packed cells will be diluted in a recipient", 'role': 'assistant'}]