<prompt> The lethal dose of fluoride for 70 kg adult is:32-64 mg of fluoridekg body weight50-60 mg of fluoridekg body weight30-70 mg of fluoridekg body weight60-80 mg of fluoridekg body weight  <response>: CERTAINLY LETHAL DOSE CLD : 32 - 64 mg of fluoridekg body wt.SAFELY TOLERATED DOSE STD : 8 - 16 mg of fluoridekg body wt.Ref: Soben peter 5th edition pg no:280 