In water-gas shift reaction, hydrogen gas is produced from the reaction of steam with:
A.Methane
B.Coke
C.Carbon monoxide
D.Carbon dioxide

Hint: The mixture of carbon monoxide and steam is known as water gas. The name of the rection, i.e. Water-Gas Shift Reaction or the WSGR is derived from the shifting of the concentration ratios of carbon monoxide and water or steam in this reaction.

Complete step by step answer:
The Water-Gas Shift Reaction or also known as the WSGR, is a type of substitution reaction. The products of the reaction are hydrogen and carbon dioxide. While the reactants on the other side were a mixture of water in the form of steam and carbon monoxide. This reaction takes place at a high pressure while producing iron, iron oxide and hydrogen.
The Water Gas shift reaction can be represented chemically as:
 $CO + {H_2}O \rightleftharpoons C{O_2} + {H_2}$
In water-gas shift reaction, hydrogen gas is produced from the reaction of steam with carbon monoxide.

Hence, Option C is the correct option.

Note:
Although it may appear that the water – gas shift reaction is reversible in nature, it is not a reversible reaction. Water-Gas Shift Reaction gets its name from two major components of the reaction:
The reaction is performed on water gas,
The term shift used in the name does not correspond to the shifting in the equilibrium between the two sides of the reaction. Instead it represents the ratio between the concentrations of Carbon monoxide to that of Hydrogen