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': 'Eugenol in a periodontal dressing could cause \nSelect and explain. \nA. allergic reaction, B. decreased resistance to heat, C. rapid bacterial growth, D. all of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]