What is the relationship between Opap and lottery in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

The largest five companies listed in Greece are Coca-Cola Hellenic - the world's second largest Coca-Cola bottler - Hellenic Telecom, National Bank (NYSE: NBHC - news ) of Greece, Opap - which runs the Greek national lottery - and Alpha Bank (Other OTC: ALBWF - news ) .

Answer: product_or_material_produced