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
What is the inhibitor of Carnitine Palmitoyl Transferase-1 ? 
Select and explain. 
A. ATP, B. Acetoacetate, C. Succinyl CoA, D. Acyl CoA
A: ATP
Answer: A: ATP 
Explanation: Ans. is 'a' i.e., ATPAs CAT-1 is an enzyme catalyzing a catabolic process(produces ATP), it is stimulated by anything which signals low energy like : ADP, NAD, FAD, Glucagon (catabolic hormone), Acyl CoA (the substrate)