# 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 is a gaseous mixture of carbon and oxygen.
It is used in medical settings as part of the early treatment of central retinal artery occlusion.
It is also used in conjunction with radiation therapy in the treatment of certain cancers.
Carbogen has been used safely for more than 50 years, however, prolonged exposure to carbon dioxide $(CO2)$ can be fatal.
edited Oct 26 by meena.p