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      Question

      Which of the following metals are toxic to humans even

      at low concentrations Options: 1. Arsenic 2. Lead 3. Iron 4. Selenium
      A Options 1, 2 & 3 are correct Correct Answer Incorrect Answer
      B Options 1 & 2 are correct Correct Answer Incorrect Answer
      C All the options (1, 2, 3 & 4) are correct Correct Answer Incorrect Answer
      D All the options (1, 2, 3 & 4) are incorrect Correct Answer Incorrect Answer

      Solution

      The correct answer is B

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