Q: Passage: Its first attribution to mean a problematic car was in a Volkswagen advertisement created by Julian Koenig and Helmut Krone as part of an advertisement campaign managed by William Bernbach, all advertising executives with the firm Doyle Dane Bernbach in 1960, which was a follow-up to their Think Small advertising campaign for VW.

Question: Based on this passage, where did the term lemon car come from? Let's give stream of consciousness first:
To answer the above question, the relevant sentence is: Its first attribution to mean a problematic car was in a Volkswagen advertisement created by Julian Koenig and Helmut Krone as part of an advertisement campaign managed by William Bernbach, all advertising executives with the firm Doyle Dane Bernbach in 1960, which was a follow-up to their Think Small advertising campaign for VW. Therefore, the final answer is a Volkswagen advertisement created by Julian Koenig and Helmut Krone as part of an advertisement campaign managed by William Bernbach.