Although Most Other Clinically Relevant Gram-Negative Bacilli Are Intrinsically Resistant

Although most other clinically relevant gram-negative bacilli are intrinsically resistant to penicillin,it is the drug of choice for infections involving:

A) Sphingomonas paucimobilis.
B) Pseudomonas aeruginosa.
C) Pasteurella multocida.
D) Weeksella virosa.