**Core Concept**
The World Health Organization (WHO) has established guidelines for sodium intake to reduce the risk of cardiovascular diseases and hypertension. These guidelines aim to promote a balanced diet and prevent excessive sodium consumption.

**Why the Correct Answer is Right**
The WHO recommends limiting sodium intake to less than 2 grams (5 millimoles) per day, ideally less than 1 gram (2.5 millimoles) per day for adults. This recommendation is based on evidence that high sodium intake is associated with increased blood pressure and cardiovascular disease risk. The WHO guidelines emphasize the importance of a balanced diet and encourage individuals to consume a variety of fruits, vegetables, and whole grains, which are naturally low in sodium.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a recommended sodium intake level. The WHO guidelines provide clear recommendations for sodium intake, which are essential for promoting public health.
**Option B:** This option is incorrect because it exceeds the recommended sodium intake level. Consuming 5 grams of sodium per day is significantly higher than the WHO's recommended limit and can increase the risk of cardiovascular disease.
**Option C:** This option is incorrect because it is not a specific recommendation for sodium intake. The WHO guidelines provide detailed recommendations for sodium intake, which are essential for promoting public health.

**Clinical Pearl / High-Yield Fact**
A useful mnemonic to remember the WHO's sodium intake guidelines is "2 Grams, 5 Millimoles": less than 2 grams (5 millimoles) of sodium per day is the recommended limit for adults.

**Correct Answer: A. Less than 2 grams (5 millimoles) per day.**