Whole hand burns represent what percentage of total body surface area:

**Core Concept**
The question requires the application of the Wallace rule of nines, a method used to estimate the total body surface area (TBSA) burned in the context of burns. The Wallace rule of nines is a simple and practical way to estimate TBSA, dividing the body into segments that are each approximately 9% of the total body surface area.

**Why the Correct Answer is Right**
The correct answer is based on the Wallace rule of nines, which states that the entire hand is approximately 1% of the TBSA. This is a well-established and widely accepted estimate, used in burn care to assess the severity of burns and guide treatment decisions. The hand is considered a single unit for the purposes of estimating TBSA.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately reflect the Wallace rule of nines. 3% would overestimate the TBSA of a single hand.
* **Option B:** This option is incorrect because it underestimates the TBSA of a single hand. The correct answer is 1%, not 0.5%.
* **Option C:** This option is incorrect because it does not accurately reflect the Wallace rule of nines. 2% would underestimates the TBSA of a single hand.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Wallace rule of nines is only an estimate and should be used in conjunction with other assessment tools, such as the Lund-Browder chart, to accurately assess TBSA in patients with burns.

**Correct Answer: A. 1%**