Which of the following is a symptom of alcohol poisoning?

A symptom of alcohol poisoning is stupor, which refers to a state of near-unconsciousness or insensibility. In the context of alcohol poisoning, stupor indicates that an individual has consumed a dangerous amount of alcohol that severely impairs their cognitive and physical functions. It can lead to a lack of responsiveness, making it difficult for the person to wake up or react to stimuli.

The other choices provided do not accurately represent symptoms of alcohol poisoning. Increased energy, a happy disposition, and clear speech are generally associated with lower levels of alcohol consumption, where a person might feel euphoric or sociable. However, in cases of alcohol poisoning, the person's condition is often critical, and vital signs, cognitive function, and physical coordination are significantly compromised. Recognizing stupor as a symptom of alcohol poisoning is crucial as it signifies a need for immediate medical intervention.