The blood culture from a patient of febrile neutropenia has grown Pseudomonas aeruginosa, It was found to be a producer of extended spectrum beta lactamase enzyme.The best choice of antimicrobial therapy should be -

• A. Ceftazidine + Amikacin
• B. Aztreonam + Amikacin
• C. Cefpirome + Amikacin
• D. Imipenem + Amikacin