This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Enzymes that protects the brain from free radical injury is 
Select and explain. 
A. Myeloperoxidase, B. Superoxide dismutase, C. MAO, D. Hydroxylase
B: Superoxide dismutase
Answer: B: Superoxide dismutase 
Explanation: Ref Robbins 7/e p17; Harrison 17/e p2572;9/e p48 Superoxide dismutase (SOD, EC 1.15.1.1) is an enzyme that alternately catalyzes the dismutation (or paitioning) of thesuperoxide (O2-) radical into either ordinary molecular oxygen (O2) or hydrogen peroxide (H2O2).