Question: HMS "Duncan" is the sixth and last of the Type 45 destroyer, an advanced class of six guided missile destroyers built for whose Royal Navy?
Sentence (from "Type 45 destroyer"): The class is primarily designed for anti-aircraft and anti-missile warfare and is built around the PAAMS (Sea Viper) air-defence system utilizing the SAMPSON AESA and the S1850M long-range radars.
Relevant evidence: No