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 toxin inhibits the peptidyl transferase? \nSelect and explain. \nA. Ricin, B. Diphtheria toxin, C. Peussis toxin, D. Amanitin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ricin In the seeds of castor beans (Ricinus communis) Glycosidase-cleaves an adenine residue from the 28S rRNA (peptidyl transferase) Lethal dose - 500 mg', 'role': 'assistant'}]