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': 'Antigen part that is attached to antibody - \nSelect and explain. \nA. Epitope, B. Paratope, C. Idiotype, D. Allotype', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Epitope Epitopeo Also known as "antigenic determinant".o It is antibody binding site of antigen.Paratopeo The part of the antibody or T cell receptor that interact with the epitope.\'The idiotype is defined as the specific region of the fab portion of the Ig molecules to which antigen binds". - Harrison', 'role': 'assistant'}]