3 yr-old presented with extreme fatigue, intolerance to physical activity and an enlarged liver.  Blood tests revealed accumulation of very high levels of lactate in blood.  Advanced tests revealed that this individual carried a mutation in the gene for a single liver enzyme.  (a) Based on the information provided, speculate on which enzyme was mutated in this individual.  Write the enzyme name here:   (b) Justify your answer to (a).     (c) Write the complete reaction (structures not required) for the reaction catalyzed by this enzyme

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