Equal masses of two gases among $$\mathrm{N_2}$$, $$\mathrm{NO}$$, $$\mathrm{O_2}$$, $$\mathrm{CO}$$, $$\mathrm{CO_2}$$ and $$\mathrm{SO_2}$$ occupy same volume at STP. These two gases are

A

$$\mathrm{N_2}$$ and $$\mathrm{O_2}$$

B

$$\mathrm{CO}$$ and $$\mathrm{NO}$$

C

$$\mathrm{SO_2}$$ and $$\mathrm{CO_2}$$

D

$$\mathrm{N_2}$$ and $$\mathrm{CO}$$