How to expose a select field to a Rules Condition? In Drupal 7, I have defined a new content type which has a checkbox field . The idea is that when a user chooses option A and submits the content, the system does something after the creation of the node, say, send an email to the webmaster and if the user choose option B or C while creating the content, the system do nothing. 

I've had difficulty to expose the select field result to a Rules Condition and I'm even not sure whether it is possible, so appreciate your help.
Well, I found my answer: 

I need to create a 'Entity has field' condition and equate it to the machine name of the field in question. 

Then the field becomes exposed in 'Data Comparison' to be evaluated.