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: Biochemistry
Enzymes concerned with the citric acid cycle are found in: 
Select and explain. 
A. Nucleus, B. Mitochondria, C. Ribosomes, D. Non-particulate cytoplasm
B: Mitochondria
Answer: B: Mitochondria 
Explanation: None