Imported Selections - How to only bet on the one with lowest odds?

Hi
I am importing horse selections by name only.
Once imported I may have more than one horse enabled for a meeting
How do I make sure my trigger only bets on the enabled horse with the lowest odds?
Thanks in advance 

Found the answer 'match_index'

I'm glad you've sorted this out. Another thing I'd like to mention is that you can sort your selections by any parameter you want (not only by price) using the condition:

Selection's Sorting Order is defined by {variable_name}
and Selection's Trigger Expression match_index

Just in case you'll need this in future.