This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Which of the following cell organelle is rich in catalases? 
Select and explain. 
A. Mitochondria, B. Ribosome, C. Peroxisome, D. Cell membrane
C: Peroxisome
Answer: C: Peroxisome 
Explanation: Peroxisomes are 0.5 m in diameter, are surrounded by a membrane, and contain enzymes that can either produce H2O2 (oxidases) or break it down (catalases). Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 2.