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 is a serious adverse effect seen with bisphosphonates - 
Select and explain. 
A. Acute renal failure, B. Ventricular fibrillation, C. Peptic ulcer, D. Anterior uveitis
A: Acute renal failure
Answer: A: Acute renal failure 
Explanation: Ans. is 'a' i.e. Acute renal failure