<prompt> Tap water scotochromogen isMycobacterium chelonaeMycobacterium marinumMycobacterium kanasaiiMycobacterium gordonae  <response>: M.gordonae often found in tap water hence called the tap water scotochromogen, is a common contaminant in clinical specimens and a rare cause of pulmonary disease. It differs from scrofulaceum in failing to hydrolyse urea, nicotinamide and pyrazinamide. Ref: Textbook of microbiology; Ananthanarayan and panikers; 10th edition; Pg: 367 