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
The immunoglobulin most commonly involved in Multiple Myeloma is : 
Select and explain. 
A. IgG, B. IgM, C. IgA, D. IgD
A: IgG
Answer: A: IgG 
Explanation: Answer is A(IgG) The M component in Multiple Myeloma can be made up of the immunoglobulins IgG, IgM, IgD, IgA, and IgE; light chains alone; or heavy chains alone. IgG Myeloma is the most common form of Multiple Myeloma while IgD (2%) and IgE (Rare) are the least common. Distribution of immunoglobulin types in patients with multiple myeloma Type of protein Percentage (%) IgG 52 IgA 22 IgM 12 IgD 2 IgE Rare