<prompt> Cause of clostridium difficile associated diarrhea -TraumaDairy productsFried riceAntibiotic use  <response>: Prolonged broad spectrum antibiotic therapy is the most important risk factor for Clostridium difficile associated diarrheaRef: Apurba Sastrys Essentials of Medical Microbiology 1e p265, Ananthanarayan 9e p265 