The enamel present on teeth becomes much harder due to the conversion of $\left[3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot X\right.$ ] into [ $3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 Y$ ]. What are $X$ and $Y$ ?

$$ \text { Match the following. } $$

List I (Drug)		List I (Use)
A	Veronal	i	Antihistamine
B	Morphine	ii	Hypnotic
C	Seldane	iii	Analgesic
		iv	$$ \text { Antidepressant } $$

$$ \text { Correct answer is } $$

Which of the following sweetener use is limited to soft drinks?