This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro Intestinal System, Subject name: Pediatrics
Recurrent obstruction, mass per rectum and diarrhea are seen in a child diagnosis: 
Select and explain. 
A. Intussusception, B. Rectal prolapse, C. Internal hernia, D. Hemorrhoids
A: Intussusception
Answer: A: Intussusception 
Explanation: a. Intussusception(Ref: Nelson's 20/e p 1812-1814, Ghai 8/e p 287)Discussing about the options one by one,Option a.Recurrent intussusception is noted in 5-8%Advancing intestine can prolapse through the anus in intussusception and is distinguished from rectal prolapse by separation between the protruding intestine and the rectal wall, which does not exist in rectal proplaseOption b.Rectal prolapse usually occurs during defecation and is usually painless or produces mild discomfortOption c.There is no diarrhea in rectal prolapse, hernia and hemorrhoidsOption d.External hemorrhoids are associated with extreme pain & itchingInternal hemorrhoids (those located above the dentate line) manifest primarily with bleeding, prolapse and occasional incarceration