Which blood type is known as the universal donor? EASY 1 Point -0.25 Negative MCQ #1316 Biology Sciences MDCAT Medical Question Which blood type is known as the universal donor? Options A AB+ B A+ C O+ D O− Reveal Answer Reset 📝 Explanation O− (O negative) is the universal donor for red blood cells because it lacks A, B, and Rh antigens, making it compatible with all blood types in emergencies. ← Previous MCQ📋 All MCQs📚 LearnNext MCQ → Related MCQs EASY The longest bone in the human body is MEDIUM The smallest bone in the human body is EASY The heart is located in