Which one of the following enzymes

The conversion of CO2 and H2O into carbonic acid during the formation of aqueous humour is catalysed by which one of the following enzymes –

1.Carboxylase
2.Carbamlasy
3.Carbonic anhydrase
4.Carbonic deoxygenase

explanation

Question is very simple. Whereever carbonic anhydrase system is present in the body, this reaction is catalysed by carbonic anhydrase, e.g. in eye, stomach, kidney.