Mercury is the only metal to be a liquid at room temperature. Which of the following statements about it is true?
A. Mercury was used to treat many illnesses long ago, and after being deemed unsafe by modern doctors it is no longer used.
B. Mercury was discovered to be toxic long ago, and is has been handled with great caution for centuries.
C. Mercury was revered for its medicinal properties but there is not enough left to use in widespread medical treatment anymore.
D. Mercury was used to treat many illnesses long ago, and after being deemed safe by modern doctors its use has increased in the past 100 years.
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