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
The enzyme phosphofructo kinase-1 is strongly activated by 
Select and explain. 
A. Cyclic AMP, B. Adenosine tri phosphate, C. Citrate, D. Fructose 2,6 bis phosphate
D: Fructose 2,6 bis phosphate
Answer: D: Fructose 2,6 bis phosphate 
Explanation: None