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
Thomsen Friedenreich phenomenon is - 
Select and explain. 
A. Red cells infection by CMV, B. Red cell agglutination by all blood group sera, C. Hemolysis of transfused blood, D. Due to B antigen
B: Red cell agglutination by all blood group sera
Answer: B: Red cell agglutination by all blood group sera 
Explanation: None