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
Probenecid interacts with ? 
Select and explain. 
A. Streptomycin, B. Ampicillin, C. Vancomycin, D. Erythromycin
B: Ampicillin
Answer: B: Ampicillin 
Explanation: Ans. is 'b' i.e., Ampicillin Interactions of probenecid Probenecid inhibits urinary excretion of penicillins, cephalosporins, methotrexate, sulfonamides and indomethacin. It inhibits biliary excretion of rifampicin. Salicylates block uricosuric action of probenecid. Probenecid inhibits tubular secretion of nitrofurantoin. Pyrazinamide and ethambutol may interfere with uricosuric action of probenecid. Note : Ampicillin is a penicillin.