This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
Site of Kreb's cycle - 
Select and explain. 
A. Cytoplasm, B. Mitochondria, C. Smooth Endoplasmic reticulum, D. Nucleus
B: Mitochondria
Answer: B: Mitochondria 
Explanation: Ans. is 'b' i.e., Mitochondria* Kreb's cycle or citric acid cycle is the final oxidation pathway wherein all three fuels, carbohydrates, lipids and proteins get oxidised to form Carbondioxide.* It happens in mitochondria.