This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
6 month old baby presents with history of bloody diarrhoea of 2 days duration with abdominal distension and on examination baby screams. What is the most probable diagnosis? 
Select and explain. 
A. Intussusception, B. Acute enterocolitis, C. Meckel's diverticulum, D. Hemolytic Uraemic syndrome
A: Intussusception
Answer: A: Intussusception 
Explanation: Intussusception

Short history of bloody diarrhoea.
Extreme tenderness on examination.