**Core Concept**
Tactile sensations refer to the sense of touch, which is mediated by mechanoreceptors in the skin. Certain toxins can alter the perception of touch, leading to abnormal sensations. The **nervous system** plays a crucial role in transmitting and interpreting these sensations.

**Why the Correct Answer is Right**
The correct answer is related to a specific type of poisoning that affects the nervous system, particularly the **peripheral nerves**. This toxin alters the function of **mechanoreceptors** and **nociceptors**, leading to abnormal tactile sensations, such as tingling, numbness, or paresthesia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not typically associated with tactile sensations.
**Option B:** This option is also incorrect as it is more commonly linked to **gastrointestinal symptoms**.
**Option C:** This option is incorrect because it is usually associated with **visual disturbances**.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that certain toxins can cause **permanent nerve damage** if not treated promptly.

**Correct Answer:** D. Thallium poisoning