This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
Zellwenger syndrome, defect is in 
Select and explain. 
A. Endoplasmic reticulum, B. Lysosome, C. Mitochondria, D. Peroxisome
D: Peroxisome
Answer: D: Peroxisome 
Explanation: Zellweger syndrome is a rare congenital disorder characterized by the reduction or absence of functional peroxisomes in the cells of an individual. It is one of a family of disorders called Zellweger spectrum disorders which are leukodystrophies . Zellweger spectrum disorder is a group of conditions that have overlapping signs and symptoms and affect many pas of the body. This group of conditions includes Zellweger syndrome, neonatal adrenoleukodystrophy (NALD), and infantile Refsum disease. Ref - <a href="