A 60 kg adult eats a 200 g portion of tuna containing 0.35 mg/kg methylmercury. Using the EPA reference dose of 0.1 µg/kg body weight per day, calculate the adult's methylmercury intake in µg/kg/day from this meal and determine whether it exceeds the EPA RfD (show calculations).

• A. Intake ≈ 0.02 µg/kg/day; it is well below the RfD and therefore poses no health concern whatsoever for adults including pregnant people.
• B. Intake ≈ 0.117 µg/kg/day; it is slightly above the RfD and represents a marginal concern requiring no dietary change.
• C. Intake ≈ 70 µg/kg/day; it vastly exceeds the RfD and would be expected to cause immediate acute mercury poisoning in adults.
• D. Intake ≈ 1.17 µg/kg/day; yes, it exceeds the EPA RfD of 0.1 µg/kg/day (about 11.7 times higher).

Answer: (D)