This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Biochemistry
Rossman fold associated NADH domain is found in which of the following enzyme: 
Select and explain. 
A. Isocitrate Dehydrogenase, B. Pyruvate Dehydrogenase, C. Citrate synthase, D. Succinate Dehydrogenase
A: Isocitrate Dehydrogenase
Answer: A: Isocitrate Dehydrogenase 
Explanation: Rossmann fold bab fold- a super-secondary structure Named after Michael Rossmann Characterized by an alternating bab (beta strand-alpha helix-beta strand) The bab fold structure is commonly observed in enzymes that have dinucleotide coenzymes(FAD, SAM, NAD and NADP) Found in a lot of dehydrogenase enzymes towards N-terminal end. It is also found in alcohol dehydrogenase enzyme The enzymes which have Rossmann fold are known as Rossmann enzymes e.g. Glyceraldehyde-3-Phosphate Dehydrogenase Alcohol Dehydrogenase Isocitrate Dehydrogenase Lactate Dehydrogenase Phosphoglycerate Dehydrogenase Glutathione Reductase D-AminoAcid Oxidase