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: Pathology
[{'content': 'Which of the following is a difference between herpangina and primary herpetic stomatitis: \nSelect and explain. \nA. It is preceded by prodromal symptoms, B. It is unilateral in nature, C. Ulcers relationship seen on the anterior faucial pillars, D. Viral etiology', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]