This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cellular Pathology, Subject name: Pathology
All of the followings are signs of reversible cell injury; except: 
Select and explain. 
A. Loss of microvilli, B. Cell Swelling, C. Bleb formation, D. Dense Mitochondrial deposit
D: Dense Mitochondrial deposit
Answer: D: Dense Mitochondrial deposit 
Explanation: Ans. (d) Dense Mitochondrial depositRef: Robbins and Cotran Pathologic Basic Disease 9th Ed; Page No-40Cell injuryReversible cell injuryIrreversible cell injury* Cellular swelling* Loss of microvilli* Formation of cytoplasmic blebs* ER swelling* Ribosomal detachment* Myelin figures* Clumping of nuclear chromatin* Flocculent, amorphous mitochondrial densities* Swelling & disruption of lysosomes* Plasma membrane damage* Pyknosis* Karyolysis* Karyorrhexis