<prompt> A 6-month-old baby presents with history of bloody diarrhea of 2 days duration with abdominal distension and on examination the baby screams, diagnosis is:IntussusceptionHUSAppendicitisAc. enterocolitis  <response>: Discussing the options one by one: a. Intussusception The typical age group with sho history of bloody diarrhea and extreme tenderness on examination point towards intussusception b. HUS Sudden onset pallor, oliguria, edema, petechiae and lethargy; Usually there is history of severe gastroenteritis with blood stained stools but no severe pain abdomen c. Appendicitis Typically presents with right lower quadrant pain with without gastroenteritis. It is most common in older children, with peak incidence between the age of 12 and 18 year d. Ac. enterocolitis There is usually a history of fever, vomiting and colicky pain abdomen, usually associated with tenesmus 