<prompt> Preauricular sinus is formed due toImproper fusion of auricular tuberclesPersistent opening of first bronchial archDegeneration of auricular tuberclesNone of the above  <response>: Preauricular appendages form due to development of accessory hillocks where as preauricular sinuspits occur due to abnormal development of auricular tubercleshillockssix mesodermal thickenings REFERENCE: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION..PAGE NO:312 