This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteoporosis, Sex Hormones and OCPs, Subject name: Pharmacology
Most common side effect seen with bisphosphonates 
Select and explain. 
A. Cholelithiasis, B. Constipation, C. Erosive esophagitis, D. Osteonecrosis
C: Erosive esophagitis
Answer: C: Erosive esophagitis 
Explanation: -Bisphosphonates like alendronate and risedronate are used for prophylaxis and treatment of osteoporosis. -Esophagitis is their distinctive side effect. -Precaution is to be taken while taking the drug is to take it with full glass of water and in a sitting/ standing position.