Which of the following is a symptom of anticholinergic syndrome?

Anticholinergic syndrome is characterized by a range of symptoms resulting from the inhibition of the neurotransmitter acetylcholine. One primary symptom often observed in cases of anticholinergic toxicity is hypertension. This occurs due to the inhibition of the parasympathetic nervous system, which ordinarily helps to lower heart rate and facilitate vasodilation. When acetylcholine activity is blocked, sympathetic overactivity can ensue, leading to increased blood pressure.

In this context, hypertension is a key indicator of the body's response to anticholinergic agents. Other symptoms associated with anticholinergic syndrome might include signs such as dry mouth, dilated pupils, flushed skin, tachycardia, and altered mental status, but it’s essential to differentiate these from the symptoms typically seen with other conditions or when the parasympathetic system is overactive.