This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Pseudomembranous colitis, all are true except \nSelect and explain. \nA. Toxin A is responsible for clinical manifestation, B. Toxin B is responsible for clinical manifestation, C. Blood in stools is a common feature, D. Summit lesions are early histopathological finding', 'role': 'user'}, {'content': "Answer: C \nExplanation: Blood in stools is not commonly seen in pseudomembranous colitis. Two high molecular weight exotoxins A and B are involved in the pathogenesis of the condition. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 270", 'role': 'assistant'}]