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: Surgery
Best Diagnosis for Ectopic gastric mucosa of meckels diveiculum - 
Select and explain. 
A. Fluoroscopy, B. Occult blood test in stool, C. Ultrasound abdomen, D. Radionuclide scan
D: Radionuclide scan
Answer: D: Radionuclide scan 
Explanation: Ans is 'd' ie. Radionuclide scan "If a Meckels diveiculum is suspected because of repeated gastrointestinal haemorrhage the abdomen can be scanned after the injection of 99Tc-labelled peechnetate intravenously. This may localise heterotopic gastric mucosa revealing the site of a meckels diveiculum in 90% of cases." - Bailey & Love