How much phosphorus is required by an adult man per day?

Explanation

Phosphorus is crucial for numerous bodily functions, including the formation of bones and teeth, and it plays a role in how the body uses carbohydrates and fats. The recommended daily intake for phosphorus for a healthy adult is between 800mg and 1200mg. Option C, 800 mg, falls within this range, making it the correct answer. Options A and B (500 mg and 400 mg) are below the recommended intake and could potentially lead to deficiency, while Option D (1800 mg) is above the recommended range and could pose health risks if consumed regularly.