A friend has taught her dog to bark whenever she says "Speak." Now, she wants to teach him a new trick by saying "Sit." But he barks whenever she says "Sit." The dog's behavior is an example of

The ________ route is commonly used to administer drugs to humans

Fill in the blank with the appropriate word.

Gina has been diagnosed with agoraphobia. If we ask her how the symptoms of the disorder started, we can expect she will say that ____

a. she has had obsessive-compulsive disorder b. she might have been worried about having a panic attack c. she had never had any problems with anxiety before d. she had symptoms that came on suddenly without any apparent reason