This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pharmacology
Not a side effect of cimitidine is 
Select and explain. 
A. Impotence, B. Gynaecomastia, C. Atrophic gastritis, D. Galactorrhea
C: Atrophic gastritis
Answer: C: Atrophic gastritis 
Explanation: Common side effects of Tagamet include: headache, dizziness, drowsiness, depression, agitation, breast swelling or tenderness (in men), joint or muscle pain, skin rash,