This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'A neonate presents with colicky pain and vomiting with sausage -shaped lump in the abdomen, Diagnosis is \nSelect and explain. \nA. Enterocolitis, B. Perforation of the abdomen, C. Intussusception, D. Acute appendicitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C. i.e. (Intussusception) (80-B & L 25th)INTUSSUSCEPTION* Typically causes a strangulating bowel obstruction, which can progress to gangrene and perforation* Commonest site is ileocolic** (80%)* Majority of affected infants - intussusception is caused by (Hypertrophy of Peyer\'s patches) hyperplasia of gut lymphoid tissue*** Either sex, peak incidence is between 5 and 10 months of age* Classically presents with colicky pain and vomiting (milk then bile)* ** "Red current Jelly" stool* Clinical sign include - dehydration, abdominal distension and a palpable sausage shaped mass in the right upper quadrant* PR examination may reveal blood or rarely the apex of an intussusceptum* Most intussusceptions can be reduced non- operatively using an air or barium enema* Most common cause of intestinal obstruction in a neonate is intussusception** Barium enema shows pincer-shaped or colied spring deformity or pitch fork sign" (1007 S. Das 5th)* Hirschsprong\'s disease is best diagnosed by - full thickness rectal biopsy**', 'role': 'assistant'}]