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: Pathology
Common sites for Cushing ulcers include all of the following except - 
Select and explain. 
A. Esophagus, B. Stomach, C. 1st part of duodenum, D. Distal duodenum
D: Distal duodenum
Answer: D: Distal duodenum 
Explanation: Cushing ulcers are stress ulcers that are associated with intracranial injury or an increase in intracranial pressure.
About the site of involvement in Cushing ulcer, the maximum information I could get was from Robbin's. It states "Gastric, duodenal and esophageal ulcers arising in patients with intracranial injury, operation or tumors are desig­nated Cushing ulcer"
So the best option to rule out is distal duodenum, as almost all duodenal ulcers are located in the proximal part.
Also, Know
Cushing's ulcers are more prone to perforate than other stress ulcers.