Question

which of the following factors can lead to precipitation of drug molecules? light ph time filters

Explanation:

Changes in pH can alter the solubility of drug molecules. When the pH of the solution in which the drug is dissolved changes, it can cause the drug to precipitate out of the solution. Light typically causes photodegradation rather than precipitation, time - alone usually doesn't directly cause precipitation without other factors at play, and filters are used to remove particles rather than cause precipitation.

Answer:

B. pH