Card 19 / 34: An 85 year-old man complains of bright red blood per rectum. He has been constipated recently. He denies any rectal pain with defecation or fever. He notes that blood will drip out after a bowel movement. A perianal exam is normal. The most likely cause of this patient's symptoms is which of the following?
1.) Anal fissure
2.) Internal hemorrhoid
3.) Anal fistula
4.) Perianal abscess
5.) External hemorrhoid

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