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
[{'content': 'Transcripton is inhibited by: \nSelect and explain. \nA. Actinomycin D, B. Amanitin, C. Chloramphenicol, D. Streptomycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Actinomycin', 'role': 'assistant'}]