Final answer:
Escherichia coli (E. coli) is the most likely bacterial pathogen in the case of a bladder infection characterized by gram-negative rods. The correct answer is option B.
Step-by-step explanation:
The most likely bacterial pathogen in the case of a bladder infection showing gram-negative rods is Escherichia coli (E. coli). E. coli is the most common causative agent of urinary tract infections (UTIs), including bladder infections. This bacterium is part of the normal flora of the human gut but can become pathogenic when it enters the urinary tract. Other pathogens listed such as Chlamydia trachomatis and Klebsiella species can also cause infections in humans but are less commonly associated with bladder infections caused by gram-negative rods.
The most likely bacterial pathogen in this case is Escherichia coli (E. coli). E. coli is a gram-negative rod-shaped bacterium that is commonly associated with urinary tract infections (including bladder infections) and is frequently found in the gastrointestinal tract of humans and animals. It is known for causing a variety of infections, including diarrhea, urinary tract infections, and sometimes serious bloodstream infections.