Previous I used the Dropdown Box option which only allowed the one answer, the Combo box gave me the option to choose a different answer to the first record.

I had previously only used 2 records and 2 options in the Combo Dialog control, so ran the mailmerge again using 4 records and 3 options, of which I could still use the different options in the Combo drop down list. You can also set in the properties that the entry cannot be deleted and cannot be edited and if required a style for the entry.