Question: What is the architecture firm who designed the grave site of Sigismondo Pandolfo Malatesta?
Paraphrase: what architectural firm designed the grave site of Sigismondo Pandolfo Malatesta?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q506640 wdt:P119 ?X . ?X wdt:P84 ?answer}
Answer: Leon Battista Alberti