This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
The following slide shows presence of? 
Select and explain. 
A. Pseudopolyps, B. Flask shaped ulcer, C. Blunting of microvilli, D. Whipple's disease
B: Flask shaped ulcer
Answer: B: Flask shaped ulcer 
Explanation: Ans. (b) Flask shaped ulcer.The image shows flask-shaped ulcer form which is seen in Entamoeba histolytica in colonic mucosa resulting in bloody diarrhea.Image source- style="font-family: Times New Roman, Times, serif">