An inert gas mixed with oxygen given to patients suffering from restricted breathing is A. Helium B. Krypton C. Radon D. Argon

Krypton, radon, and argon are also inert gases, but they are not typically used in medical settings. Krypton is a relatively rare gas that is used in some industrial applications. Radon is a radioactive gas that is produced by the decay of uranium. Argon is a common gas that is used in lighting and insulation.

Helium is the best choice for patients suffering from restricted breathing because it is a light gas that can help to open up the airways and make it easier to breathe. It is also non-flammable, which makes it safe to use in medical settings.