True or False?
Phoenix, Arizona, is home to thousands of retirees. More and more of them have dementia.
For a chance to win, e-mail your answer and phone number to firstname.lastname@example.org, with BBC Knowledge 5 in the subject field. Closing date is noon, Monday, October 24. Winners will be notified by e-mail. The answer will be revealed on this page next week.
Watch Louis Theroux: Extreme Love - Dementia, on Oct 19, 9.55pm (NowTV 220 / CableTV 49) to find out the answer.
*** The competition is not open to any members of SCMP or BBC staff or their family members.