The two USP dissolution apparatuses are Basket system Type 1 and Paddle system Type 2.

• A. False
• B. True
• C. Basket system Type 1 and Paddle system Type 2
• D. Paddle Type 1 and Basket Type 2

Answer: (C)

In USP dissolution testing, the two standard apparatus are the Basket system (Type 1) and the Paddle system (Type 2). This statement is correct because USP designates Apparatus 1 as the Basket and Apparatus 2 as the Paddle, forming the canonical pair used for solid dosage forms. The Basket apparatus uses a rotating mesh basket to hold the dosage while dissolution occurs in the surrounding medium, whereas the Paddle apparatus stirs the medium with a paddle to promote dissolution without a basket. While there are other USP dissolution devices, these two are the ones most commonly referenced as the primary dissolution apparatuses. If an option suggested a different pairing or swapped the type numbers, it would not align with USP designations.