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: Anaesthesia
[{'content': 'Difficult intubation is anticipated in all except \nSelect and explain. \nA. Increase in posterior depth of mandible, B. Increased alveolar- mental distance, C. Receeding incisors, D. Temporomandibular joint fibrosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Protruding incisors make intubation difficult.', 'role': 'assistant'}]