<prompt> Rigid esophagoscopy is not done in -a Cervical spine rigidity b Aortic aneurysmc Carcinoma esophagus d Esophageal webe Lung abscessacabadbc  <response>: Contraindications of esophagoscopy rigid type:TrismusAneurysm of aortaReceding mandibleAdvanced heart, liver, kidney diseases relative contraindication.Diseases of cervical spine, e.g. cervical trauma, spondylitis, TB, osteophytes, kyphosis, etc. 