**Core Concept**
The World Health Organization (WHO) has established guidelines for recommended daily salt intake to help prevent cardiovascular disease and other health issues associated with excessive sodium consumption. These guidelines are based on scientific evidence and aim to promote public health.

**Why the Correct Answer is Right**
The WHO recommends a daily salt intake of less than 5 grams to reduce the risk of cardiovascular disease, hypertension, and stroke. This recommendation is supported by numerous studies that have shown a significant association between high sodium intake and increased blood pressure. The body's natural mechanisms for regulating blood pressure are overwhelmed by excessive sodium, leading to increased cardiovascular morbidity and mortality. The WHO's recommendation is based on the understanding that a diet with low sodium content is essential for maintaining optimal blood pressure levels and overall cardiovascular health.

**Why Each Wrong Option is Incorrect**
**Option B:** This option suggests a daily salt intake of less than 6 grams, which is still above the recommended level set by the WHO. While reducing sodium intake to this level may offer some benefits, it does not align with the organization's guidelines for optimal cardiovascular health.
**Option C:** A daily salt intake of less than 7 grams is also above the recommended level. This option may be seen as a compromise, but it does not reflect the WHO's evidence-based recommendation for the lowest risk of cardiovascular disease.
**Option D:** A daily salt intake of less than 8 grams is not in line with the WHO's guidelines, which aim to reduce sodium intake to the lowest possible level to minimize the risk of cardiovascular disease and other health issues.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the WHO's recommendation for a daily salt intake of less than 5 grams is based on the idea that small reductions in sodium intake can lead to significant improvements in cardiovascular health. By promoting a low-sodium diet, healthcare professionals can play a crucial role in preventing and managing chronic diseases.

**✓ Correct Answer: A. < 5 gm/d**