This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Gastrointestinal System Including Diarrhea, Subject name: Pediatrics
[{'content': '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: \nSelect and explain. \nA. Intussusception, B. HUS, C. Appendicitis, D. Ac. enterocolitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]