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Select the correct statement.

(a) Particulate matter of size 10 μm can create severe damage to the lungs.
(b) Particulate matter of size greater than 2.5 $\mathrm{\mu }$m can get trapped in lungs and cause problems.
(c) Particulate matter of size less than 2.5 μm penetrate deep into lungs.
(d) None of the above.

AIIMS