Which of the following symptoms might indicate acute carbon monoxide poisoning?

The indication of acute carbon monoxide poisoning is primarily associated with the presence of cherry-red skin. This symptom occurs due to the way carbon monoxide binds with hemoglobin in red blood cells, forming carboxyhemoglobin. This binding prevents oxygen from being carried throughout the body effectively, leading to a variety of symptoms. The cherry-red coloration is a classic, albeit not always present, clinical sign that can occur in severe cases of carbon monoxide exposure.

Other symptoms such as confusion, increased urination, and severe anxiety can manifest for various reasons, including other medical conditions or stress responses but are not characteristic indicators of acute carbon monoxide poisoning. They do not specifically correlate with the physiological effects of carbon monoxide and lack the acute specificity that cherry-red skin presents in such poisoning cases. Therefore, cherry-red skin remains the most clinically relevant and identifiable symptom of acute carbon monoxide exposure when assessing a patient.