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
Which of the following is catabolic pathway? 
Select and explain. 
A. Cholesterol synthesis, B. Glycogenesis, C. Fatty acid synthesis, D. Ketone body synthesis
D: Ketone body synthesis
Answer: D: Ketone body synthesis 
Explanation: Both Ketone body synthesis and ketone body breakdown are catabolic pathways.