<human>: Question: How long were Jefferson and Hemmings in a relationship?

Is "As noted in the 2012 collaborative Smithsonian-Monticello exhibit, Slavery at Monticello: The Paradox of Liberty, Jefferson, then a widower, took Hemings as his concubine for nearly 40 years." the correct answer?

OPTIONS:
- yes
- no
<bot>: yes