Which of the following is not used as a medium for high temperature heating ?

[A].	Dowtherm
[B].	mercury
[C].	liquid metal (e.g. molten sodium)
[D].	fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

Answer: Option B

Explanation:

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