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
[{'content': 'All of the following statements regarding penicillin-G are true, EXCEPT: \nSelect and explain. \nA. Can be given orally, B. Active against gram positive organisms, C. Probenecid given along with penicillin-G increases its duration of action, D. Acts by inhibition of cell wall synthesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Penicillin G is acid labile and it is destroyed easily by gastric acid, and hence it can only be given parenterally (intravenously or intramuscularly) and not orally. Ref: KDT, 6th Edition, Pages 696-97 ; Streptococcal Pharyngitis: Optimal Management By Jean Claude Pechere, 3rd Volume, Page 188 ; Drugs in Pregnancy and Lactation: A Reference Guide to Fetal and Neonatal Risk By Gerald Briggs, Roger K. Freeman, Sumner J. Yaffe, Page 205', 'role': 'assistant'}]