This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
Patient is on Autocoids for 1 year now complains of severe pain Epigastrium relieved by antacid drugs. He complaints of Right Iliac fossa pain and loss of liver dullness. Diagnosis is: 
Select and explain. 
A. Perforation of duodenum, B. Diverticulitis, C. Gastroenteritis, D. Enteric perforation
A: Perforation of duodenum
Answer: A: Perforation of duodenum 
Explanation: Ans. (a) Perforation of duodenum* This is a clear-cut case of drug induced ulcer and perforation - Duodenal ulcer perforation* Features are diffuse abdominal pain with right iliac fossa pain due to tracking of pus in right colic gutter - Valentino Syndrome* Obliteration of liver dullness* Board like rigidity