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': 'Interferon is....in nature - \nSelect and explain. \nA. Protein, B. Lipid, C. Polysaccharides, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All cytokines are protein mediators so interferon Reff: Anantharayan & Panikers textbook f microbiology 9th edition pg:153', 'role': 'assistant'}]