**Core Concept**
The WHO stepwise approach to Surveillance (STEPS) is a public health tool designed to collect, analyze, and disseminate data on non-communicable diseases (NCDs) and their risk factors. It is a standardized method that helps WHO member countries monitor and address the growing burden of NCDs.

**Why the Correct Answer is Right**
The STEPS approach involves a three-step process: Step 1, which collects data on cardiovascular diseases and diabetes; Step 2, which collects data on other NCDs; and Step 3, which collects data on risk factors such as tobacco use, physical activity, and diet. This approach enables countries to identify trends, set priorities, and develop targeted interventions to address NCDs.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the STEPS approach. While the approach does involve data collection, it is not limited to just one aspect of NCDs.
**Option B:** This option is incorrect because it is too vague and does not provide any specific information about the STEPS approach.
**Option C:** This option is incorrect because it is not a part of the STEPS approach. While the approach does involve data collection, it is not limited to just one type of data.

**Clinical Pearl / High-Yield Fact**
The STEPS approach is a valuable tool for public health professionals, as it provides a standardized framework for collecting and analyzing data on NCDs and their risk factors. By using this approach, countries can identify trends and develop targeted interventions to address the growing burden of NCDs.

**Correct Answer:** None provided. Please provide the correct answer in the format: Correct Answer: [Letter]. [Answer Text].