In the reaction X+Y (R) Z, Z is the

A)Substrate
B)Product
C)Enzyme
D)Carbon Molecule

To determine which option represents Z in the reaction X+Y → Z, we need to understand the terms involved.

In chemical reactions, the substances involved in the reaction are categorized into two main groups: reactants and products.

The reactants are the substances that undergo a chemical change or reaction. In this case, the reactants are X and Y.

The products are the substances formed as a result of the reaction. The product is denoted by Z in the given reaction.

From the given options, we can conclude that Z is the product of the reaction X+Y → Z (since the other options are not related to the product). Hence, the answer is B) Product.