Dynamic content from last Custom Object entry

Hi,

I have a Custom Data Object driving Dynamic Content, however I'd like the rules to look at the last entry into the Custom Data Object. One contact can have multiple entries into the custom object, however my Dynamic Content picks up the first assigned to the contact.

I am not showing the entry from the Custom Object in all cases - I have set text I want to show depending on the answers. Using Merge Fields can achieve what I want but only shows the entry.

I am sure there is a setting somewhere to help me achieve this.