Select the correct statements from the following.
(i) Innate immunity develops after exposure to pathogens.
(ii) Intravenous drug abusers are at high risk of HIV infection.
(iii) Chemotherapy is the best treatment of cancer since it has no side effects.
(iv) Barbiturates are used to treat insomnia.

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(i) and (iv)

(ii) and (iv)

(ii) and (iii)

(i) and (iii)

answer is B.

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Detailed Solution

Innate immunity is present at the time of birth. Acquired immunity develops after exposure to a specific pathogen, either through infection or vaccination.
HIV spreads through body fluids (blood and semen). Intravenous drug abusers and people who require periodic blood transfusions are at high risk of HIV infection since it spreads through blood
Chemotherapeutic drugs used to treat cancer have side effects like alopecia (hair loss), anaemia, etc.
Barbiturates are a class of central nervous system depressants. They are commonly prescribed to treat insomnia, as they can produce a sedative effect that helps individuals to fall asleep and stay asleep.

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