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: Pathology
[{'content': 'A simple bacterial test for mutagenic carcinogens is: \nSelect and explain. \nA. Ames test, B. Redox test, C. Bacteriophage, D. Gene splicing', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]