<prompt> Most common cause of syndromic deafness is:Usher syndromeWaardenburg syndromePendred syndromeAll of the above  <response>: Pendred syndrome is the most common syndromic form of deafness, accounting for approximately 10 of cases. It presents with goiter and sensorineural hearing loss. Usually, the goiter is evident before pubey, but an adult onset has also been noted. Thyroid function is evenly divided, with 50 euthyroid patients and 50 hypothyroid patients. In most cases, the hearing loss is congenital, bilateral, moderate to profound, and sloping in the higher frequencies. An enlarged vestibular aqueduct is a consistent finding, and Mondini-type malformations have also been associated. 