This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanisms of Cell Injury, Subject name: Pathology
All are reversible injury of cell, except 
Select and explain. 
A. Vacuole, B. Karyorrhexis, C. Fat accumulation, D. Cell wall swelling
B: Karyorrhexis
Answer: B: Karyorrhexis 
Explanation: Ans is 'b' Karyorrhexis