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: Medicine
Warm antibody in autoimmune hemolytic anemia 
Select and explain. 
A. IgM, B. IgG, C. IgE, D. IgA
B: IgG
Answer: B: IgG 
Explanation: Warm antibody is IgG.