**Core Concept**
Leprosy, also known as Hansen's disease, is a chronic bacterial infection caused by *Mycobacterium leprae*. It primarily affects the skin and peripheral nerves, leading to a range of clinical manifestations. Neural involvement is a critical aspect of the disease, resulting from the bacteria's tropism for Schwann cells in the peripheral nervous system.

**Why the Correct Answer is Right**
Neural involvement in leprosy occurs due to the direct infection and damage of Schwann cells, which are responsible for myelination in the peripheral nervous system. This leads to demyelination, axonal degeneration, and subsequent neuropathy. The percentage of patients with neural involvement varies depending on the type of leprosy, with a higher incidence in the more severe forms. In multibacillary leprosy, which accounts for the majority of cases, neural involvement is nearly universal.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because neural involvement is not limited to a specific percentage in lepromatous leprosy; rather, it is a characteristic feature of the disease.
* **Option B:** This option is incorrect because the percentage of patients with neural involvement in tuberculoid leprosy is actually higher than in the other forms of the disease.
* **Option C:** This option is incorrect because the percentage of patients with neural involvement in lepromatous leprosy is not lower than the other forms; in fact, it is the most severe form of the disease.

**Clinical Pearl / High-Yield Fact**
It's essential to note that neural involvement in leprosy often presents with numbness, tingling, and pain in the affected limbs, which can be accompanied by muscle weakness and atrophy. Early recognition and treatment of leprosy are critical to prevent long-term damage to the peripheral nerves.

**Correct Answer:** 90%.