At the moment, I think, the answer field for comparison has to be selected
and enabled in the deck using Anki Desktop. See Issue 743 here:
http://code.google.com/p/ankidroid/issues/detail?id=743
To enable the field, open the deck in Anki on a desktop machine, choose
Settings > Deck Properties... > Basic, select a model and click Edit, and
click Card Layout. (Or, if all your cards use the same model, you can also
just click the Card Layout button while reviewing on the desktop.) Near
the bottom of the Card Templates tab is a drop-down list where you can
change "Don't ask me to type in the answer" to "Compare with field 'Back'"
or whatever field is appropriate.
Mike
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