<s>[INST] context: (Colo.rectal carcioma) (1310-CSDT 12th) (1160-B &L 25th)* Although diverticulitis, cancer and / angiodysplasia are the most common cause of lower GI bleeding in adults (1310-CSDT 12th)* Diverticular diseases (Very common in western countries, though it is quite rare in this country (1104. S.Das 5th)Diverticulitis (1161-B&L)Symptoms and signs of colorectal cancer (1178-B & L)Complications1. Recurrent periodic abscess2. Perforation leading to general peritonitis3. Intestinal obstruction4. Haemorrhage - profuse colonic haemorrhage5. Fistula formation Diverticulitis is not a precancerous conditions but cancer may coexist* Right sided tumour - Iron deficiency anemia, abdominal mass* Left sided tumours - rectal bleeding alteration in bowel habit, tenesmus obstruction* Metastatic disease - Jaundice, ascitis, hepatomegaly, other symptoms and sign from rarer sites of metastasis.* In Infants - anal fissures continue to be the most common cause of rectal bleeding.* Juvenile polyps - are the single most common cause of lower GI bleeding in children (20-30%) [/INST] question: Most common cause of lower gastro intestinal bleeding is; | options: A: Diverticulitis B: Colorectal carcinoma C: Angiodysplasia D: Anal fissure | answer: B </s>