What happened to chimpanzees previously used in research?

• A. Euthanized
• B. Transferred to another lab
• C. Retired to designated sanctuaries or be retired "in-place"
• D. Kept as pets

Answer: (C)

Disposal and welfare policy for chimpanzees used in research now prioritizes retirement from biomedical work, either to sanctuaries or as in-place retirement, rather than continuing to use them in experiments or euthanizing them. This reflects regulatory and ethical shifts (notably NIH policy changes in the 2010s) that moved the majority of chimpanzees previously involved in NIH-funded research out of invasive work. Sanctuaries provide long-term, socially appropriate environments for these highly social, long-lived animals, while some facilities can retire chimpanzees in place if they can guarantee proper care and no further research use. So the option describing retirement to designated sanctuaries or retirement in place best matches current practice. Euthanizing, transferring to another lab, or keeping as pets are not the standard outcomes under these policies.