Excess fluoride in drinking water can cause the following , except

Options :
  1. deformity of teeth
  2. hardening of bones
  3. stiff and painful joints
  4. diarrhoea

Answer and Explanation :-

Answer: Option 4


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You come of the Lord Adam and the Lady Eve," said Aslan. "And that is both honour enough to erect the head of the poorest beggar, and shame enough to bow the shoulders of the greatest emperor on earth. Be content.
-C.S. Lewis Prince Caspian