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: Unknown
Which of the following is not associated with pseudomembranous colitis? 
Select and explain. 
A. Toxin A is responsible for clinical manifestation, B. Toxin B is responsible for clinical manifestation, C. Gross blood in stools is common, D. Summit lesion is early histopathological finding
C: Gross blood in stools is common
Answer: C: Gross blood in stools is common 
Explanation: Clostridium difficile produce 5 toxins, toxin A and B are most studied and both causes pseudo membranous colitis. The “Summit” or “volcano” lesions are seen due to mucosal micro ulceration. Diarrhea is soft to watery or mucoid in consistency but never with gross blood