I chose other because I think the term addictive may be interpreted with a negative tone and addictive to me implies some sort of chemical dependence that leads to something not positive. I think the people who most report wanting a therapy "fix" think of it as positive and it may not lead as directly to physical breakdown as say an opiate. If any dependence equals addictive - then I would say therapists set the game up so that clients are more likely to become dependent upon them in more instances than not.
For me, I do not enjoy the appointments nor look forward to the way I feel before, during or after, and I cancel a lot. If chemical is involved - the one(s) released for me in interacting with the therapist are not the positive ones like oxytocin. (10 Reasons Why Oxytocin Is The Most Amazing Molecule In The World). So for me it is not what I would think of as an addictive situation.