**Core Concept**
Strychnine poisoning affects the nervous system, leading to muscle convulsions. The **lateral curve of the body** is a result of these convulsions, causing an abnormal posture. This condition is related to the **neurotoxic effects** of strychnine.

**Why the Correct Answer is Right**
The correct answer is related to the **opisthotonus** posture, which is a characteristic feature of strychnine poisoning. This posture is caused by the **inhibition of glycine receptors** in the spinal cord, leading to **muscle spasms** and **convulsions**. The lateral curve of the body is a result of these spasms.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not describe the lateral curve of the body.
**Option B:** This option is also incorrect as it is not related to the effects of strychnine poisoning.
**Option C:** This option is incorrect because it does not accurately describe the posture caused by strychnine poisoning.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that strychnine poisoning causes **opisthotonus**, which is a characteristic **arched posture**. This is a classic sign of strychnine toxicity.

**Correct Answer:** D. Opisthotonus