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': 'Inhibition of protein synthesis in translation phase is: due to \nSelect and explain. \nA. Isoniazide, B. Ethambutol, C. Methotrexate, D. Cycloserine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]