Which of the following is NOT a characteristic of narcotics?

Narcotics, also known as opioids, are primarily substances that are used to relieve pain. One of their main characteristics is their pain-reducing capability, making option B a defining trait. They also have significant effects on mood, which corresponds with option D, as they can create feelings of euphoria or sedation. Furthermore, narcotics are well-known for their potential to cause dependency, which aligns with option C, as prolonged use can lead to both physical and psychological dependence.

However, enhancing physical performance is not a characteristic associated with narcotics. In fact, narcotics can result in sedation and a decrease in physical coordination and reaction time. This is why enhancing physical performance does not fit with the effects typically attributed to narcotics. Therefore, option A is the correct answer in this context, highlighting a significant distinction between narcotics and substances that do enhance physical performance.