Take the following as truth: The concentration of the metals Al, As, Cr, Co, Cu, Fe, Pb, Ni, and Zn, expressed as total metal, should not exceed 1 mg/L each, and Cd, Hg, and Ag, expressed as total metal, should not exceed 100 ng/L each.
Then the following statement: "This is because those metals are toxic at that level." is true, false, or inconclusive?
Answer: Inconclusive