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: ENT
Injury to superior laryngeal nerve causes: 
Select and explain. 
A. Hoarseness, B. Paralysis of vocal cords, C. No effect, D. Loss of timbre of voice
D: Loss of timbre of voice
Answer: D: Loss of timbre of voice 
Explanation: Ans. is d e. Loss of timbre of voice Paralysis of Superior Laryngeal Nerve -causes paralysis of cricothyroid muscle which is a tensor of vocal cord. Clinical Features Voice is weak and pitch cannot be raised. U/L Anaesthesia of larynx above the level of vocal cords causing occasional aspiration.