How to create Boolean Field in CDS for an entity

Hi Team,

I am using Core Data Services for my Table or Entity creation and i am facing one issue with CDS.

There is no Boolean Primitive type in CDS and i am unable to create User defined types for boolean.

eg.

Entity Test

{

element Answer: String(200);

element IsCorrect:Boolean;//This is not working

}

Kindly Help.

Thanks

Varathan