This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Pathology
Old male with H/O long intake of antibiotics. Diagnosis? 
Select and explain. 
A. Pseudomembranous Colitis, B. Chrons, C. Ulcerative colitis, D. Amoebic colitis
A: Pseudomembranous Colitis
Answer: A: Pseudomembranous Colitis 
Explanation: Ans. (a) Pseudomembranous enterocolitisThe mucosal surface of the colon seen here is hyperemic and is partially covered by a yellow-green exudate.