Correct answer:

The passage of bright red blood per rectum is a common symptom, which the patient usually attributes to ‘piles’; indeed, haemorrhoids are by far the commonest cause of rectal bleeding. It is important, however, to bear in mind a list of possible causes of this symptom.
(1) General causes: bleeding disorders (rare).
(2) Local causes: tumours of the colon and rectum (benign or malignant); haemorrhoids; diverticular disease; ulcerative colitis; fissure in ano; haemorrhage (rarely); angiodysplasia of the colon; trauma.