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: Unknown
Immunoglobulin that activates the alternate complement pathway is: 
Select and explain. 
A. Ig A, B. Ig G, C. Ig M, D. Ig E
A: Ig A
Answer: A: Ig A 
Explanation: (Refer: Ananthanarayanan and Paniker’s Textbook of Microbiology, 8th edition, pg no: 94–96)
 
Immunoglobulin nuggets