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 following drug's absorption is increased in gastric achlorhydria ? 
Select and explain. 
A. Ketoconazole, B. Penicillin G, C. Chloramphenicol, D. Ciprofloxacin
B: Penicillin G
Answer: B: Penicillin G 
Explanation: None