This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Voice and Speech Disorders, Subject name: ENT
Female patient with male like voice. Type of thyroplasty done: 
Select and explain. 
A. I, B. II, C. III, D. IV
D: IV
Answer: D: IV 
Explanation: Ans. (d) IVThere are 4 types of thyroplasty done, depending on the pathology* Type I: Medialization (Done for Abducted Vocal Cord)* Type II: Lateralization(Done for Adducted Vocal Cord)* Type III: Relaxation, shortening (in order to lower down the pitch)* Type IV: tensioning, Lengthening (in order to increase the pitch)