**Core Concept**
Copper sulphate poisoning is a form of heavy metal poisoning that occurs due to the ingestion of copper sulphate, a compound containing copper and sulphur. The toxic effects of copper sulphate are primarily due to the release of copper ions, which can cause cellular damage and disrupt various physiological processes.

**Why the Correct Answer is Right**
Copper sulphate poisoning can cause gastrointestinal symptoms, including nausea, vomiting, and abdominal pain, due to the corrosive effects of copper ions on the gastrointestinal mucosa. Additionally, copper sulphate can cause hemolysis, leading to anemia and jaundice. The correct answer is related to the gastrointestinal symptoms caused by copper sulphate poisoning.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while hemolysis is a possible consequence of copper sulphate poisoning, it is not the most characteristic feature.
**Option C:** This option is incorrect because while jaundice can occur due to hemolysis, it is not the most specific feature of copper sulphate poisoning.

**Clinical Pearl / High-Yield Fact**
A key aspect of copper sulphate poisoning is its corrosive effect on the gastrointestinal mucosa, which can lead to severe abdominal pain and vomiting. This can be a critical consideration in the management of patients with copper sulphate poisoning.

**Correct Answer:** A. Nausea and vomiting.