Passage Reading: GATE2011 AG: GA-10
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 used to
A. give immunity to diseases
B. generally give immune to diseases
C. given medicines to fight toxins
D. given diphtheria and tetanus serums
GATE 2011 · General Aptitude · Passage Reading · medium
Answer: A. give immunity to diseases
Identify the key action described in the passage: The passage states: 'Horses were injected with toxins of diseases until their blood built up immunities.' The blood-immunity is the resource that was harvested.
Evaluate each option against the passage: A. 'give immunity to diseases' — horses provided immune material (correct). B. 'generally give immune to diseases' — grammatically awkward and overly general. C. 'given medicines to fight toxins' — the passage says horses were given toxins, not medicines. D. 'given diphtheria and tetanus serums' — the serums were made FROM horses, not given TO them.