<prompt> A patient of Acute lymphocytic leukemia with fever and neutropenia develops diarrhoea after administration of amoxicillin therapy, which of the following organism is most likely to be the causativeagent -Salmonella typhiClostridium difficileClostridium perfringensShigella flexneri  <response>: Ans. is b i.e., Clostridium difficile 