This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anitibody, Subject name: Microbiology
[{'content': 'IgM is: \nSelect and explain. \nA. Monomer, B. Dimer, C. Pentamer, D. Tetramer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) PentamerRef: Anatnayayan 9/ e page 98AntibodyEffective valency* IgM5* IgG2* IgD2* IgE2* IgA2,4Also Know* Ig having maximum molecular weight: IgM* First antibody produced by newborn: IgM* All immuniglobulin are heat stable EXCEPT: IgE* Ig present in breast milk: IgA* Ig with maximum half life: IgG* Ig with minimum half life: IgE* Ig having maxilum serum concentration: IgG * Ig having least serum concentration: IgE', 'role': 'assistant'}]