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
[{'content': 'The enzyme phosphofructo kinase-1 is strongly activated by \nSelect and explain. \nA. Cyclic AMP, B. Adenosine tri phosphate, C. Citrate, D. Fructose 2,6 bis phosphate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]