This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid disorders, Subject name: Pediatrics
True about pendred syndrome: 
Select and explain. 
A. Genenralised edema, B. No goiter, C. Mental retardation, D. B/L sensory neural deafness
D: B/L sensory neural deafness
Answer: D: B/L sensory neural deafness 
Explanation: PENDRED syndrome: Autosomal recessive disorder Caused by mutations in the PDS gene on chr 7 - codes for pendrin (SLC 26A4) - chloride-iodide transpoer, impoant in hearing and thyroid pathway. FEATURES: Congenital b/L SNHL+ Goitre & Hypothyroidism