This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Most common manifestation of clostridium difficile infection is: \nSelect and explain. \nA. Fever, B. Leukocytosis, C. Abdominal pain, D. Diarrhea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common manifestation of clostridium difficile infection is Diarrhea Stool is soft, watery or mucoid in consistency, with a characteristic odor with 20 bowel movements per day. Other features: Fever in 28% Abdominal pain in 22%, Leukocytosis in 50% Unexplained leukocytosis, with 15,000 white blood cells (WBCs)/L may indicate c. difficile infection. Complications: 1. Toxic megacolon and sepsis. Ref: Harrison, Edition-18, page-1092.', 'role': 'assistant'}]