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: Dental
[{'content': 'The response which is graded by an observer on agree or disagree continuum is based on? \nSelect and explain. \nA. Visual analogue scale, B. Guttman scale, C. Likert scale, D. Adjective scale', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]