The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
In Medieval times, what would be the most likely form of treatment for someone suffering the symptoms of a psychological illness?
Answer: "exorcism."
Yes, as crazy as it would sound today, in Medieval times, exorcism would be the most likely form of treatment for someone suffering the symptoms of a psychological illness.
Let's have in mind that those were the years of dark ages of Medieval times in which the Catholic Church exerted a major influence on the life and customs of people. In those years, something that could not be explained under the church purview was considered to be evil and the solution was as drastic as an exorcism.