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
Which of the following pigment s are involved in free radical injury 
Select and explain. 
A. Lipofuscin, B. Bilirubin, C. Melanin, D. Hematin
A: Lipofuscin
Answer: A: Lipofuscin 
Explanation: Ref, Robbins 7/ep39,9/e p64