Question: What Lake Toba accident resulted in the least missing persons ?
Paraphrase: What Lake Toba accident had the least missing people?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q171558 . ?ent wdt:P1446 ?obj . ?ent wdt:P276 wd:Q183360. } ORDER BY ASC(?obj)LIMIT 5 
Answer: sinking of MV Sinar Bangun