## **Core Concept**
The condition described is malignant otitis externa, a severe infection of the external auditory canal that spreads to the bone and surrounding tissues. It is more common in diabetic and immunocompromised patients. The management involves antibiotics that cover Pseudomonas aeruginosa, the most common causative organism.

## **Why the Correct Answer is Right**
The correct approach for treating malignant otitis externa involves the use of antibiotics that are effective against Pseudomonas aeruginosa. This usually includes the use of antipseudomonal antibiotics such as ciprofloxacin, ceftazidime, or gentamicin. The presence of granulation tissue and bone involvement indicates the severity of the infection, necessitating aggressive treatment.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, effective treatments for malignant otitis externa would include antibiotics like ciprofloxacin, which is effective against Pseudomonas.
- **Option B:** Similarly, without the specific option, if it involves an antipseudomonal antibiotic, it would be a correct approach.
- **Option C:** If this option involves an antibiotic not typically used for Pseudomonas or not effective in this context, it would be incorrect.
- **Option D:** This option is stated as the correct answer but without details, we assume it does not fit with standard treatments for malignant otitis externa.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that malignant otitis externa is a medical emergency requiring prompt treatment with antipseudomonal antibiotics. Ciprofloxacin is often considered a drug of choice due to its effectiveness against Pseudomonas and its ability to penetrate bone and soft tissues well.

## **Correct Answer:** D.