أي علامة في البراز تدل غالباً على نزيف من أسفل القولون أو المستقيم؟

Which stool finding usually indicates bleeding from the lower colon or rectum?

1. Fatty floating foul-smelling stool
2. Black tarry stool
3. Bright red blood on the stool surface
4. Pale clay-coloured stool

Answer: C) Bright red blood on the stool surface. Bright red blood usually comes from the lower colon, rectum or haemorrhoids. Tarry black stool is upper GI, clay-coloured is biliary obstruction and fatty stool is fat malabsorption.