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# Which isotope of hydrogen is/are radioactive in nature?

$\begin{array}{1 1}(a)\;\text{Protium and Deuterium}\\(b)\;\text{Tritium only}\\(c)\;\text{Tritium and Deuterium}\\(d)\;\text{Only Deuterium}\end{array}$

Tritium is radioactive isotope of hydrogen.
Hence (b) is the correct answer.