**Core Concept**
Leprosy, caused by Mycobacterium leprae, affects the peripheral nerves and skin, leading to various sensory and motor deficits. The disease spectrum ranges from tuberculoid (paucibacillary) to lepromatous (multibacillary) leprosy, with intermediate forms.

**Why the Correct Answer is Right**
The correct answer choice, B (ce), is because leprosy is characterized by an **abnormal response to sensory stimuli**, known as the "hyporeflexia" or "diminished reflexes" in the early stages, rather than an **increased response**. This is due to the destruction of peripheral nerves and the resultant loss of sensory input. Additionally, **voluntary muscle wasting** is a feature of advanced lepromatous leprosy, but not a hallmark of the disease in its early stages. The other options, abnormal EMG, decreased proprioception, and decreased response to tactile sensation, are indeed seen in leprosy.

**Why Each Wrong Option is Incorrect**
**Option A:** Abnormal EMG is a feature of leprosy, particularly in the lepromatous form, where it reflects nerve damage and muscle atrophy.
**Option C:** Decreased proprioception is a feature of leprosy, as the disease affects the peripheral nerves responsible for transmitting proprioceptive information.
**Option D:** Decreased response to tactile sensation is a feature of leprosy, particularly in the tuberculoid form, where it reflects nerve damage and loss of sensation.

**Clinical Pearl / High-Yield Fact**
Leprosy can be divided into two main clinical forms: tuberculoid and lepromatous, with intermediate forms. Tuberculoid leprosy is characterized by a strong immune response, leading to granuloma formation and nerve damage, while lepromatous leprosy is characterized by a poor immune response, leading to bacterial proliferation and tissue destruction.

**✓ Correct Answer: B. ce**