$A$ - Smoking increases $O_2$, content in blood. $R$ - Nicotine stimulates adrenal gland.
$A$ - Smoking increases $O_2$, content in blood. $R$ - Nicotine stimulates adrenal gland.
- A
$A$ and $R$ both are correct.
- B
$A$ and $R$ both are incorrect.
- C
$A$ is correct, $R$ is incorrect.
- D
$A$ is incorrect, $R$ is correct.
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