<prompt> In tubo-tympanic CSOM commonest operation done is:Modified radical mastoidectomyRadical mastoidectomySimple mastoidectomyTympanoplasty  <response>: d TympanoplastyRef. Scott Brown, 8th ed., Vol 2; 997Management of tubo-tympanic CSOM is tympanoplastyRadical and modified radical mastoidectomy are done for unsafe CSOM.Simple mastoidectomy or Schwartze operation is done for acute and coalescent mastoiditis. 