THEME AND FOCUS: GLYCOLYSIS Case Study: A 42-year-old man presented with symptoms of weakness, fatigue, shoness of breath, and dizziness. His hemoglobin level was less than 7 g/dl (normal for a male being greater than 13.5 g/dl). Red blood cells of the patient showed abnormally low level of lactate production. Heinz bodies were not found in PBF. Lead Question: Deficiency of which one of the following enzymes would be the most likely cause of this patient's anemia?