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
Cold agglutinins are seen in - 
Select and explain. 
A. Influenza, B. PAN, C. Multiple myeloma, D. SLE
A: Influenza
Answer: A: Influenza 
Explanation: Answer- A. InfluenzaThis form of hemolytic anemia is caused by cold agglutinin IgM antibodies.Both intravascular and extravascular hemolysis may occur.Causes of cold agglutinin immunohemolytic anemia :- Mycoplasma infection, IMN, CMV, Influenm, HIV, Malignant lymphoma.