Question: What disease suffered by Robin Roberts was the subject of "Cancer Vixen: A True Story?"?
Answer(s):
answer: Breast cancer

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06k3_t)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06k3_t ns:medicine.notable_person_with_medical_condition.condition ?x .
?x ns:book.book_subject.works ns:m.04wcqs_ . 
}