The horse has played a little known but very important role
in the field of medicine. Horses were injected with toxins
of diseases until their blood built up immunities. Then a
serum was made from their blood.Serums to fight with
diphtheria and tetanus were developed this way.

It can be inferred from the passage, that horses were
(A) given immunity to diseases
(B) generally quite immune to diseases
(C) given medicines to fight toxins
(D) given diphtheria and tetanus serums


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