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
Fanconi's syndrome is caused by- 
Select and explain. 
A. Cephalosporins, B. Chloramphenicol, C. Decreased pseudocholinesterase, D. Old and degraded tetracycline
D: Old and degraded tetracycline
Answer: D: Old and degraded tetracycline 
Explanation: Ans. is 'd' i.e., Old and degraded tetracycline o A fanconi syndrome like condition is produced by outdated tetracyclines due to proximal tubular damage caused by degraded products ---> epitetracycline, anhydrotetracycline, and epianhydrotetracycline.