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Physics a level/as

can someone pls help me with this question ive been stuck for quite a while
explain why a photon of energy 2 MeV could produce an
electron- positron pair but not a proton- antiproton pair.
Reply 1
Rest energy of electron: 0.510999 MeV
Rest energy of proton: 938.257 MeV
(Rest energies are same for anti- variants of particles)
Because conservation of energy applies, a photon of energy 2 MeV could only produce an electron-positron pair but not a proton-antiproton pair.

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