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
Difficult intubation is anticipated in all except 
Select and explain. 
A. Increase in posterior depth of mandible, B. Increased alveolar- mental distance, C. Receeding incisors, D. Temporomandibular joint fibrosis
C: Receeding incisors
Answer: C: Receeding incisors 
Explanation: Protruding incisors make intubation difficult.