This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Hemagglutinin (Anti A and Anti B) are which type of antibodies - \nSelect and explain. \nA. Ig G, B. Ig M, C. Ig A, D. IgE', 'role': 'user'}, {'content': "Answer: B \nExplanation: IgM is a heavy molecule. - IgM molecules are polymers of five four-peptide subunits. the earliest immunoglobulin synthesized by the fetus. - the isohemagglutinins ( anti- A, anti - B ) and many other natural antibodies to microorganisms are usually IgM. ReReference:nathanarayan & paniker's 9th edition, pg no: 98 <\\p>", 'role': 'assistant'}]