Compare daily intakes: a person consumes 1,200 mg calcium and 45 µg molybdenum. Convert molybdenum to mg and determine which is a major mineral intake and which is trace.

• A. Molybdenum cannot be converted to mg for dietary interpretation because all trace minerals are reported only in µg and major minerals only in mg; therefore classification is not possible without re-measuring intakes in standardized units.
• B. Molybdenum = 0.045 mg; calcium (1,200 mg) is major, molybdenum (0.045 mg) is trace.
• C. Molybdenum = 45 mg; both calcium and molybdenum would be major minerals because both are above 100 mg/day after conversion.
• D. Molybdenum = 0.00045 mg; calcium would be trace and molybdenum ultratrace because modern analytical chemistry suggests different cutoffs than dietary guidance.

Answer: (B)