This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Radiology
Most sensitive investigation for diagnosis of Meckel's diverticulum is? 
Select and explain. 
A. USG, B. CT Scan, C. Barium enema, D. 99m-Tc pertechnetate scan
D: 99m-Tc pertechnetate scan
Answer: D: 99m-Tc pertechnetate scan 
Explanation: Ans DImaging wise Meckel diverticulum appears like normal bowel, however Meckel's bleeds because it has ectopic gastric mucosa - secretes acid - damages the mucosa. Most common presentation of Meckel's: GI bleedingQ with abdominal pain. Tc99m - pertechnate scan is most sensitive for diagnosisQ