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
Which of the following inhibit gastric secretion by blocking H2 receptors: March 2013 
Select and explain. 
A. Omeprazole, B. Ranitidine, C. Sucralfate, D. Misoprostol
B: Ranitidine
Answer: B: Ranitidine 
Explanation: Ans. B i.e. Ranitidine Ranitidine It is a histamine H2-receptor antagonist that inhibits stomach acid production. It is commonly used in treatment of peptic ulcer disease (PUD) and gastroesophageal reflux disease (GERD).