This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Translation, Subject name: Biochemistry
[{'content': 'Which of the following is the donor of ADP-ribose for ADP-ribosylation reactions? \nSelect and explain. \nA. Adenosine triphosphate, B. Adenosine monophosphate, C. Nicotinamide adenine dinucleotide, D. Flavin mononucleotide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ADP-ribosylation One of the histone post-translational modifications. NAD+ acts as the source of ADP-ribose. Eg : Mechanism of action of cholera toxin, diphtheria toxin and ricin', 'role': 'assistant'}]