This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
Which of the following drugs has maximum chances of absorption from gastric mucosa 
Select and explain. 
A. Diclofenac sodium, B. Morphine sulfate, C. Hyoscine hydrobromide, D. Quinine dihydrochloride
A: Diclofenac sodium
Answer: A: Diclofenac sodium 
Explanation: Ref-Katzung 10/e p7,8 Diclofenac is an acidic drug and is non-ionized in the acidic medium of stomach.therefore,it has the maximum chances of absorption from the stomach.other drugs in the options are basic drugs that are ionized at gastric pH