Attack of asthama in certain persons may be due to
(a) eating of some seasonal vegetation
(b) inhalation of some air-borne pollen
(c) exposure to cold temperature
(d) low concentration of CO₂ due to increase rate of photosynthesis

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Solution

(b) inhalation of some airborne pollen

Asthma occurs due to irritation of the respiratory system, which is the result of inhaling an airborne pollen.

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