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: Surgery
[{'content': 'Which of the following is not always a true odontogenic infection \nSelect and explain. \nA. Periapical abscess, B. Periodontal abscess, C. Maxillary sinusitis, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: → Orofacial infections may be odontogenic or non-odontogenic in nature.\n→ Majory of odontogenic infections are caused by the endogenous bacteria present in the oral cavity. Eg: Periapical and periodontal infections.\n→ Most of non-odontogenic infections are associated with an underlying medical condition Eg: Non-odontogenic infections of the skin, tonsils, or maxillary sinuses.\n→ Occasionally, infections could develop following an anesthetic injection or a surgical procedure.', 'role': 'assistant'}]