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
In patients with asthma due to an allergic cause, the
serum levels of which immunoglobulin increases? 
Select and explain. 
A. IgD, B. IgM, C. IgA, D. IgE
D: IgE
Answer: D: IgE 
Explanation: None