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Q: Most popular eye drop preservative:
  • A. BHA
  • B. BHT
  • C. Methyl paraben
  • D. Benzalkonium chloride
Correct Answer: Option D - Benzalkonium chloride in the most commonly used eye drop preservative. Benzalkonium chloride has been associated with toxic effects such as "dry eye" and trabecular meshwork degeneration, but the underlaying biochemical mechanism of ocular toxicity by Benzalkonium chloride is unclear.
D. Benzalkonium chloride in the most commonly used eye drop preservative. Benzalkonium chloride has been associated with toxic effects such as "dry eye" and trabecular meshwork degeneration, but the underlaying biochemical mechanism of ocular toxicity by Benzalkonium chloride is unclear.

Explanations:

Benzalkonium chloride in the most commonly used eye drop preservative. Benzalkonium chloride has been associated with toxic effects such as "dry eye" and trabecular meshwork degeneration, but the underlaying biochemical mechanism of ocular toxicity by Benzalkonium chloride is unclear.