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': 'Which of the following immunoglobulins shows homocytotropism - \nSelect and explain. \nA. IgG, B. IgA, C. IgE, D. IgD', 'role': 'user'}, {'content': "Answer: C \nExplanation: IgE is an 8 S molecule. - resemble IgG structurally. - heat liable - an affinity for the surface of tissue cells paicularly mast cells of the same species. This feature is called homocytotropism. - the normal serum contains only traces of IgE ( a few nanograms per ml ) - greatly elevated levels in atopic conditions like asthma, hay fever. Reference : Anathanarayan & paniker's 9th edition, pg no: 98,98 <\\p>", 'role': 'assistant'}]