<prompt> Which is not a fibrous joint:GomphosesCranial suturesFirst costochondral jointInferior tibiofibular joint  <response>: First costochondral joint is a hyaline cailage joint synchondrosis or syscendrosis, which is a type of primary cailagenous joint. Sutures of skull, Inferior tibifibular joint syndesmosis, denotalveolar joint gomphosis are examples of fibrous joint. 