How can I return just one column value rather than the entire C# class/SQLite table?

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WinRT

I have this code in my WinRT app:

internal static List<PhotraxBaseData> GetPhotosets()
{
    List<PhotraxBaseData> psets = new List<PhotraxBaseData>();
    using (var db = new SQLite.SQLiteConnection(App.DBPath))
    {
        // Does SQLite support "DISTINCT"?
        string sql = "SELECT DISTINCT photosetName FROM PhotraxBaseData ORDER BY
photosetName";
        psets = db.Query<PhotraxBaseData>(sql);
    }
    return psets;
}

Which is called this way:

private void flyoutOpenPhotosets_Opened(object sender, object e)
{
    lstbxPhotosets.ItemsSource = PhotraxSQLiteUtils.GetPhotosets();
}

What I end up with this is a listbox filed with items that say: "Photrax.Model.PhotraxBaseData"

All I want is just that one column (photosetName), but when I tried to return List<String> instead of List<PhotraxBaseData> like so:

internal static List<String> GetPhotosets()
{
    List<String> psets = new List<String>();
    using (var db = new SQLite.SQLiteConnection(App.DBPath))
    {
        string sql = "SELECT DISTINCT photosetName FROM PhotraxBaseData ORDER BY
photosetName";
        psets = db.Query<String>(sql);
    }
    return psets;
}

...I get, on this line: "psets = db.Query<String>(sql);", the following compile-time err msg:

'string' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method 'SQLite.SQLiteConnection.Query<T>(string, params object[])'

So how can I accomplish this?