The most preferred medium in dissolution testing is water. Which of the following is a correct alternative set of options?

• A. Water
• B. Alcohol
• C. Acetone
• D. Ether

Answer: (A)

When selecting a dissolution medium, safety, compatibility with the dosage form, and minimal interference with analysis are key. Water is the most suitable default medium because it is inert, non-toxic, non-volatile, and widely compatible with a broad range of tablets and capsules. It won't interact with the drug or excipients in unpredictable ways and it avoids safety hazards and analytical interferences that come with organic solvents.

In contrast, the organic solvents listed—alcohol, acetone, and ether—are flammable and hazardous to handle. They can alter the tablet matrix, change solubility dynamics, or interfere with the analytical methods used to quantify drug release, making them unsuitable as general-purpose dissolution media. Therefore, water is the best choice among the options.