**Core Concept**
Klebsiella pneumoniae is a Gram-negative bacterium that can cause severe infections, particularly in patients with compromised immune systems or those with underlying medical conditions. The treatment of Klebsiella infections involves the use of antibiotics that are effective against this bacterium, taking into account the potential for antibiotic resistance.

**Why the Correct Answer is Right**
The treatment of Klebsiella pneumoniae typically involves the use of antibiotics such as carbapenems (e.g., meropenem, imipenem), cephalosporins (e.g., ceftriaxone, cefotaxime), and aminoglycosides (e.g., gentamicin). These antibiotics are effective against a wide range of Gram-negative bacteria, including Klebsiella. However, the use of trimethoprim-sulfamethoxazole (co-trimoxazole) is generally not recommended for the treatment of Klebsiella infections due to the high rate of resistance.

**Why Each Wrong Option is Incorrect**
**Option A:** Carbapenems are commonly used to treat Klebsiella infections, making this option incorrect.
**Option B:** Cephalosporins are also effective against Klebsiella, so this option is incorrect.
**Option C:** Aminoglycosides are used to treat Klebsiella infections, so this option is incorrect.

**Clinical Pearl / High-Yield Fact**
It's essential to note that antibiotic resistance patterns can vary depending on the geographical location and local epidemiology of the bacterium. Therefore, it's crucial to consult with local guidelines and consult with an infectious disease specialist when treating Klebsiella infections.

**Correct Answer:** D. Trimethoprim-sulfamethoxazole