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
Which of the following factors contribute to the development of duodenal ulcers -a) Lysolecithinb) Gastric acidc) Alcohol abused) Prostaglandinse) Smoking 
Select and explain. 
A. bce, B. bc, C. acd, D. ace
A: bce
Answer: A: bce 
Explanation: None