This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology Pa 2 ( Hybridoma Technology, Complement Pathways, Interferon, Structure and Functions of Immune Cells ), Subject name: Microbiology
IFN beta stimulated by: 
Select and explain. 
A. Bacterial infection, B. Viral infection, C. Fungal infection, D. Mycoplasma infection
B: Viral infection
Answer: B: Viral infection 
Explanation: Interferons are species specific which inhibit the viral protein synthesis and there secretions are stimulated by viral infections. INTERFERONS SECRETORY CELLS IFN -alpha Leucocyte IFN-beta Fibroblast IFN-gamma T-lymphocytes