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# Carbogen is _____________

$\begin{array}{1 1}(a)\;Pure\;form\;of\;carbon\\(b)\;COCl_2\\(c)\;Mixture\;of CO\;and\;CO_2\\(d)\;Mixture\;of\;O_2\;and\;CO_2\end{array}$

Carbogen has been used safely for more than 50 years, however, prolonged exposure to carbon dioxide $(CO2)$ can be fatal.