Question: What is the name of the painting stolen on March 19, 1990 for which a museum initially offered a $5 million reward for information leading towards its recovery?
Sentence (from "Isabella Stewart Gardner Museum theft"): The museum initially offered a reward of $5 million for information leading to their recovery, but in 2017 this was doubled temporarily to $10 million with an expiration date set to the end of the year.
Relevant evidence: Yes