<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 4-year-old Caucasian male patient presents with recurrent infections. During examination of his CD4 T-cells, it is noticed that his T-cells lack CD40 ligand. Which type of immunoglobulin is likely to be present in excess?? A: IgA, B: IgE, C: IgG, D: IgM, E: IgD,  <response>: This question is asking about a patient with a defect in CD40 ligand, which is important for T cell-dependent B cell activation and immunoglobulin class switching. The lack of CD40 ligand results in Hyper IgM syndrome, characterized by normal or elevated levels of IgM and low levels of other immunoglobulin classes that require class switching IgG, IgA, IgE.D: IgM 