**Core Concept**
Leprosy, also known as Hansen's disease, is a chronic bacterial infection caused by *Mycobacterium leprae* that primarily affects the skin, peripheral nerves, and mucous membranes. Multibacillary leprosy is characterized by a high bacterial load and is more likely to cause significant tissue damage.

**Why the Correct Answer is Right**
The World Health Organization (WHO) recommends a follow-up examination after adequate treatment for multibacillary leprosy to detect any potential relapse or complications. This follow-up is crucial for early detection and management of any adverse reactions or new lesions. The recommended follow-up interval for multibacillary leprosy is yearly for the first 5 years after completion of treatment.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the recommended follow-up interval for multibacillary leprosy is not every 6 months.
* **Option B:** This option is incorrect because the recommended follow-up interval for multibacillary leprosy is not every 2 years.
* **Option C:** This option is incorrect because the recommended follow-up interval for multibacillary leprosy is not every 5 years, but rather every year for the first 5 years.

**Clinical Pearl / High-Yield Fact**
It is essential to note that patients with multibacillary leprosy require a longer duration of treatment (12 months) compared to paucibacillary leprosy (6 months).

**Correct Answer: D. every year for the first 5 years**