What is the relationship between Boston Pizza and restaurant 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.

Negative same restaurant sales results for the quarter were principally due to declines in restaurant guest traffic and the temporary closure of all dining rooms and sports bars in Boston Pizza restaurants across Canada, starting on March 17, 2020, both as a result of the COVID pandemic.

Answer: product_or_material_produced