[单选题]
When a positronium atom (electr5jsp 4tek2f h+on + positron) decb iptt- ms5*m:ays, it emits two photons. What are the energies of t: -ttm 5spimb*he photons?
A. 0.511 MeV and 1.022 MeV
B. 0.225 MeV and 0.285 MeV
C. 0.256 MeV and 0.256 MeV
D. 0.511 MeV and 0.511 MeV
