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': 'Testing with cold is carried out best: \nSelect and explain. \nA. To localize papal pain, B. To localize periodontal pain, C. For detecting referred pain, D. To test pulp necrosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]