## Core Concept
The question pertains to the effects of a specific poisoning on various bodily secretions. The poisoning in question appears to involve the autonomic nervous system, which regulates involuntary functions, including the control of glandular secretions. Understanding the autonomic nervous system's role in controlling secretions such as salivation, lacrimation, urination, and gastrointestinal (GI) secretions is crucial.

## Why the Correct Answer is Right
The correct answer, , relates to the secretion that is not decreased in this context of poisoning. Typically, poisoning that affects the autonomic nervous system, such as organophosphate or anticholinergic poisoning, can have varied effects on glandular secretions. For instance, organophosphate poisoning leads to an increase in secretions due to the inhibition of acetylcholinesterase, resulting in an accumulation of acetylcholine, which stimulates muscarinic and nicotinic receptors. On the other hand, anticholinergic poisoning decreases secretions by blocking muscarinic receptors. Given that the question asks for a secretion not decreased, it implies a scenario where one might expect decreased secretions overall, such as in anticholinergic toxicity. In such cases, **sweating** might not necessarily be decreased; it can be affected but the body's response can vary.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically decreased in scenarios of reduced parasympathetic activity (e.g., anticholinergic syndrome), which includes decreased salivation.
- **Option B:** Refers to a decrease in lacrimation, which is also expected in conditions with reduced parasympathetic activity.
- **Option C:** This option, if related to GI secretions or motility, would likely be decreased in conditions affecting the autonomic control, particularly with anticholinergic effects.
- **Option D:** Not applicable as it is the correct answer.

## Clinical Pearl / High-Yield Fact
In anticholinergic poisoning, which characteristically decreases various secretions, **sweating** can be an exception as the body's response to heat and stress can still induce sweating. A classic presentation of anticholinergic toxicity includes dry mouth (decreased salivation), dry eyes (decreased lacrimation), and urinary retention, but sweating might not be as straightforwardly decreased.

## Correct Answer Line
**Correct Answer: D. Sweating**