How to give Column Name in Select Item if using DataTable as List in Uipath Apps

Perfect!!!
Just one query

My DataTable have 3 Columns

“Country”, “D.O.B”, “Full Name”

The Dropdown List is only picking the Values from DT when passing the 1st Column Name “Country” but showing blank for the rest of the two.

Below is the expression in List Source:

What changes do I need to make in expression editor so that my DataTable should read any Column Name I Pass.

Thanks in Advance