Final answer:
Andrea Mantegna used the technique of realism to represent the body of Christ in the artwork "The Dead Christ".
Step-by-step explanation:
The artist of the artwork "The Dead Christ" is Andrea Mantegna. The technique used to represent Christ's body in the artwork is Realism. Mantegna's painting shows the body of Christ as truly dead, with figures struggling to hold his dead weight and ease him down gently into his tomb.