<prompt> Tellurite stimulates growth ofE. coilCl. TetaniCorynebacterium diphtheriaeSalmonella  <response>: Tellurite inhibits the growth of most other bacteria acting as a selective agent for diphtheria bacilli. Diphtheria bacilli reduce Tellurite to metallic tellurium which is incorporated in colonies giving them a grey or black colour. Reference: Textbook of Microbiology; Anathanarayan and panickers; 10th edition; Page no: 242 