Final answer:
NAISDs reduce inflammation, which could include the vocal folds, but they also dry mucous membranes affecting vocal strain. The correct answer is they mainly work to reduce inflammation.
Step-by-step explanation:
NAISD drugs, which likely refers to Nonsteroidal Anti-inflammatory Drugs (NSAIDs), typically do not directly affect the vocal cords in terms of flexibility or strength. Their primary effect is to reduce inflammation, which could potentially involve the vocal folds if they are inflamed due to overuse or an infection. However, NSAIDs can cause drying of the mucous membranes, which has a secondary effect on the vocal folds, potentially leading to vocal strain or a temporary change in voice quality if not used with proper hydration and care. Therefore, the correct answer to the question of how NSAIDs affect the vocal folds is they can cause inflammation if used improperly or in certain sensitive individuals, but they primarily work to reduce inflammation.