If There are 20 Chromatids in a Cell,how Many Centromeres

Question

If there are 20 chromatids in a cell,how many centromeres are there?
A)10
B)20
C)30
D)40
E)80

Accepted Answer

Each pair of sister chromatids has one centromere, so if there are 20 chromatids, there must be 10 centromeres.