This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'The response which is graded by an observer on an agree or disagree continuum is based on - \nSelect and explain. \nA. Visual analog scale, B. Guttman scale, C. Like scale, D. Adjective scale', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]