Question: Is Charles Drummond Ellis a doctoral student of James Chadwick?
SPARQL query: ASK WHERE { <http://dbpedia.org/resource/James_Chadwick> <http://dbpedia.org/ontology/doctoralStudent> <http://dbpedia.org/resource/Charles_Drummond_Ellis> }
Answer: [Yes], Charles Drummond Ellis is a doctoral student of James Chadwick.