This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'Antibiotic associated diarrhea is caused by \nSelect and explain. \nA. CI. difficile, B. Cholera, C. Salmonella, D. Klebsiella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Inflammation of the colon caused by the bacteria Clostridium difficile. Clostridium difficile colitis results from disruption of normal, healthy bacteria in the colon, often as a result of antibiotics. C. difficile can also be transmitted from person to person by spores. It can cause severe damage to the colon and even be fatal Antibiotic-associated diarrhoea is among the most common adverse events related to antibiotic use. Most cases are mild, but Clostridium difficile infection causes a spectrum of disease, ranging from occasional diarrhoea to colitis, toxic megacolon, and potentially death Ref Harrison20th edition pg 1123', 'role': 'assistant'}]