Kisimul Castle (Scottish Gaelic: "Caisteal Chiosmuil" ) and also known as Kiessimul Castle, is a small medieval castle located on a small island off Castlebay, Barra, in the Outer Hebrides, Scotland. It gets its name from the Gaelic "cìosamul" meaning "castle island".

Can we draw the following conclusion?
Caisteal Chiosmuil means castle island.

Choose from: a. Yes. b. It's impossible to say. c. No.
a.