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': 'Periodontal abscess is formed in \nSelect and explain. \nA. Periapical area, B. Alveolar bone laterally, C. Periodontal ligament laterally, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]