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
Phosphofructokinase-I is activated by all except: 
Select and explain. 
A. 5'AMP, B. Fructose 2,6 Bisphosphate, C. Fructose 6 Phosphate, D. Citrate
D: Citrate
Answer: D: Citrate 
Explanation: Ans. D. Citrate(Ref: Harper 31/e page 175 Table 19-1)EnzymeInducerRepressorActivatorInhibitorHexokinase Glucagon Glucose 6-phosphateGlucokinaseInsulinGlucagon Phosphofructokinase-1InsulinGlucagon5'AMP, fructose 6-phosphate, fructose 2,6-bisphosphate, Inorganic PhosphateCitrate, ATP, glucagonPyruvate kinaseInsulinGlucagonFructose 1,6-bisphosphate, insulinATP, Alanine, Glucagon, norepinephrine