Flask shaped ulcers in colon is caused by:-: (A) Giardia lamblia, (B) Entamoeba histolytica, (C) H. Pylori, (D) Enterobius vermicularis
Answer is B. Amoebiasis: M/C pathogenic amoeba in humans - E. histolytica Trophozoites of E. histolytica attaches to submucosa of cecum & ascending Colon to produce "FLASK SHAPED ULCERS" and causes abscess.