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Help with physics option J: Particles

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I'm told:free neutron decays to proton and releases e-,how do I know if this is a strong/weak/electromagnetic interaction?

The only information I'm told is that an electron is produced in the decay of a free neutron into a proton. The question is state the name of the exchange particle. To know this, I suppose I have to figure out what kind of interaction this is, but I don't get how. I thought originally that it was a strong interaction because it involves nucleons, but the mark scheme says the answer is W boson... why?!

Thanks

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The question relates to neutron beta decay, which is a weak interaction, so indeed the exchange particle is the W-boson. (One of the down quarks in the proton is transformed into an up quark plus a W-boson, which decays to an electron plus an electron antineutrino. Only the weak interaction can change the flavour of quarks)

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