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: Microbiology
[{'content': 'Thomsen Friedenreich phenomenon is - \nSelect and explain. \nA. Red cells infection by CMV, B. Red cell agglutination by all blood group sera, C. Hemolysis of transfused blood, D. Due to B antigen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]