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
NAD+ linked dehydrogenase is ? 
Select and explain. 
A. PDH, B. G6PD, C. Enoyl reductase, D. Succinate dehydrogenase
A: PDH
Answer: A: PDH 
Explanation: NAD/ -linked dehydrogenases Pyruvate dehydrogenase, isocitrate dehydrogenase, malate dehydrogenase, a-ketoglutarate dehydrogenase, glutamate dehydrogenase, glyceraldehyde-3-P dehydrogenase, lactate dehydrogenase, 3-hydroxy acyl CoA dehydrogenase, glycerol 3-P dehydrogenase (cytoplasmic).NADP+-linked dehydrogenases Glucose-6-P dehydrogenase, 6-Phosphogluconate dehydrogenase, 3-ketoacyl reductase, Enoyl reductase.FAD-linked dehydrogenases Succinate dehydrogenase, fatty acyl CoA dehydrogenase, glycerol-3P dehydrogenase (mitochondria]).