## Core Concept
The question pertains to the pharmacology of *Datura*, a plant known for its anticholinergic properties. *Datura* contains several tropane alkaloids, which are responsible for its medicinal and toxic effects.

## Why the Correct Answer is Right
The active principles of *Datura* include **scopolamine**, **hyoscyamine**, and **atropine**. Atropine is actually a racemic mixture of hyoscyamine. These compounds act as anticholinergics by blocking muscarinic acetylcholine receptors.

## Why Each Wrong Option is Incorrect
- **Option A:** Scopolamine is indeed an active principle of *Datura*, contributing to its anticholinergic effects.
- **Option B:** Hyoscyamine is also a correct active principle, which is often found in higher concentrations and is known for its anticholinergic and mydriatic effects.
- **Option C:** Atropine, being a racemic mixture of hyoscyamine, is correct as well.

## Why Option D is Correct (Implication for Wrong Options)
- **Option D:** The correct answer provided is . However, based on common knowledge, *Datura* does contain scopolamine, hyoscyamine, and atropine. A less commonly referenced compound or an incorrect option might involve substances not typically associated with *Datura* or a misunderstanding of the plant's alkaloid composition.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that *Datura* intoxication can cause anticholinergic toxicity, manifesting with symptoms like delirium, hallucinations, dilated pupils, tachycardia, and dry mouth. Recognizing the plant's potent anticholinergic effects is crucial for managing poisonings.

## Correct Answer: D.