Final answer:
The statement that Pseudomonas aeruginosa and other Gram-negative bacteria should have varied sensitivity to different antibiotics is true due to potential differences in resistance mechanisms.
Step-by-step explanation:
The sensitivity of Pseudomonas aeruginosa, which is a Gram-negative bacterium, to different antibiotics can indeed vary. Antibiotics like Ampicillin, Chloramphenicol, Tetracycline, Streptomycin, and Erythromycin have different mechanisms of action and susceptibility patterns against various bacteria. Pseudomonas aeruginosa is intrinsically resistant to many antibiotics due to its outer membrane barrier and efflux pumps. However, in a laboratory setting, when testing organism sensitivity, variations can occur due to factors like mutations, plasmid acquisition, or environmental stress, which selects for resistant strains.
Given the context, the statement that organisms A, B, and C should have shown varied sensitivity to Ampicillin, Chloramphenicol, Tetracycline, Streptomycin, and Erythromycin is typically true due to the potential for differing resistance mechanisms and genetic contributions to drug resistance.