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 are true regarding cephalosporins except : \nSelect and explain. \nA. Bactericidal agents, B. Active against only gram negative bacteria, C. IIIrd Generation are resistant to B-lactamases from gram negative bacteria, D. ceftriaxone is administered parenterally', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]