1140. Influenza is caused by_____________? September 27, 2025 by Admin A. Orthomyxo virus, which is a DNA virus B. Paramyxo virus, which is a RNA virus C. Paramyxo virus, which is a DNA virus D. Orthomyxo virus, which is a RNA virus ✅ The correct answer is option Orthomyxo virus, which is a RNA virus.