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
All of the following are indications for surgery in a case of duodenal ulcer EXCEPT - 
Select and explain. 
A. Acute perforation of ulcer, B. Pyloric stenosis, C. Massive haemorrhage, D. Typical periodicity
D: Typical periodicity
Answer: D: Typical periodicity 
Explanation: None