Final answer:
Cocaine generally leads to physiological effects such as dilated pupils due to its stimulant properties, and although it can cause decreased appetite, dilated pupils (option A) is the correct response to the physiological effect cocaine produces.
Step-by-step explanation:
One of the physiological effects that cocaine produces is dilated pupils (A). Cocaine is a powerful stimulant and part of its action includes causing vasoconstriction, which is the narrowing of blood vessels. This action leads to several physiological changes, one of them being the expansion of the pupils. Additionally, cocaine’s ability to prevent the reuptake of dopamine in the brain is responsible for both the drug's euphoric high and its addictive potential. As for the other options, B is incorrect because vasoconstriction would likely lead to increased blood pressure, not decreased. Option C, a sudden dryness of the skin and a flushed appearance, is not typically associated with cocaine use, which is more known for causing sweating due to its stimulant effects. Lastly, while option D, decreased appetite, is a known effect of cocaine, it is not the correct answer to this specific question.