Starch is converted into maltose by the

Identify the enzyme that catalyses the reaction of $CO_{2}$ with water in the human body.

Match the items in Column-$I$ with the appropriate items in Column-$II$.

Column-$I$	Column-$II$
$A$. Zymase	$i$. Absence of air
$B$. Invertase	$ii$. Copper sulphate and pyridine
$C$. Anaerobic condition	$iii$. Sucrose
$D$. Denaturation of ethanol	$iv$. Ethanol

$C_{12}H_{22}O_{11} + H_2O \stackrel{\text{Enzyme A}}{\longrightarrow} C_6H_{12}O_6 + C_6H_{12}O_6$
$\text{Sucrose} \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \text{Glucose} \quad \quad \quad \quad \text{Fructose}$
$C_6H_{12}O_6 \stackrel{\text{Enzyme B}}{\longrightarrow} 2C_2H_5OH + 2CO_2$
$\text{Glucose}$
In the above reactions,the enzyme $A$ and enzyme $B$ respectively are :-

An enzyme is a .......

Pheromones are chemicals