This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Increased amounts of calcium in the cytosol of an injured cell reflect a release of calcium from stores in the 
Select and explain. 
A. Peroxisomes, B. Smooth Endoplasmic Reticulum, C. Lysosomes, D. Mitochondria
D: Mitochondria
Answer: D: Mitochondria 
Explanation: Increased amounts of calcium in the cytosol of an injured cell result from an influx from extracellular space, mitochondria, and rough endoplasmic reticulum.