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 are involved in free radical injury 
Select and explain. 
A. Lipofuscin, B. Melanin, C. Bilirubin, D. Hematin
A: Lipofuscin
Answer: A: Lipofuscin 
Explanation: ref Robbins 7/e p39, 9/e p64 also called wear and tear pigment or pigment ageing Derived through lipid peroxidase Perinuclear in location Indicative of free radical injury to cell Prominent in ageing ,severe malnutrition and cancer ,cachexia