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: Pharmacology
Effective ulcer treatment that works by inhibitory action on gastric acid secretion is ? 
Select and explain. 
A. Lactulose, B. Aluminium hydroxide, C. Sucralfate, D. Ranitidine
D: Ranitidine
Answer: D: Ranitidine 
Explanation: Ans. is 'd' i.e., Ranitidine o Among the given options, only ranitidine decreaes acid secretion.