This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding from the GUT and diseases of esophagus, Subject name: Medicine
Which of the following is located in Laimer's triangle: 
Select and explain. 
A. Esophageal diveiculum, B. Colonic diveiculum, C. Meckel's diveiculum, D. Peri -ampullary diveiculum
A: Esophageal diveiculum
Answer: A: Esophageal diveiculum 
Explanation: Cervical esophageal diveiculum (Zenker Diveiculum) is located in Killian-Laimer triangle which is located inferior to the cricopharyngeus in the posterior midline above the confluence of the longitudinal layer of esophageal muscle. Laimer's triangle is covered only by the circular layer of esophageal muscle.