This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which of the following beta lactam antibiotic can be safely used in a patient with a history of allergy to Pencillin \nSelect and explain. \nA. Aztreonan, B. Cefepime, C. Loracarbef, D. Ceftriaxone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer KDT 6/e p708 Aztreonan is the only beta lactam anti6 that can be used in patients having severe allergy to Pencillin or cephalosporin', 'role': 'assistant'}]