Conclusion: herbal remedies should be treated by the FDA as medicines. (That means herbal medicines must meet some certain quality standards)
Assumption: We can say herbal medicines need some quality check to ensure its quality, might be because there are some negative effects involved in the herbal medicines.
In order to strengthen the conclusion that the herbal medicines need quality check, we have to prove herbal medicines have some negative impacts.
Among options:
(A) Herbs often contain antioxidants and essential oils that provide anti-inflammatory relief.(This weakens the passage stating the Stregthening point of herbal medicines and if herbal medicines are good for health, there will be no need for quality check) (Incorrect)
(B) Burdrock apparently has a certain diuretic property that helps the body to expel toxins. (Although we don't know whether it's a herbal medicine or Allopathy, but we know it's not showing any negative effect. While we are seeking negative effect of herbal medicines) (Incorrect)
(C) Up tp 80 percent of some Asian and African cultures rely on herbal remedies in part for healthcare.(This statement don't really negate or strengthen the argument but if they are used by such majority (80%) there must be some positive use of herbal medicines, we want opposite effect) (Incorrect)
(D) Certain herbal remedies increase heart rate, which can be lethal for cardiac patients.(Yes, this point shows the negative effect of herbal medicine, hence strengthening the argument. The reason why herbal medicine need to get quality check) (Correct)
(E) A variety of industrial plants are grown expressly to be used in modern prescription medicines.(No effects are been mentioned here, neither negative nor positive, but we have D as better option which strengthen the argument) (Incorrect)
Answer is D
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