In the context of the input sentence, determine the relationship between 'Tesco Bank' and 'Tesco'.
Options: publisher, founded by, parent organization, subsidiary

Tesco Bank offers 1.6pc on instant-access savings The new rate, which includes an introductory bonus, is an improvement but not quite a best buy Tesco Bank's new interest rate shows the financial environment is improving Photo: Alamy By Amelia Murray
parent organization