The answer is: [D]: "os" .
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The opening for the "cervical canal" is called the:
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→ "cervical os" .
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Note that: "os" — means "mouth" in Latin; which is similar to "opening' .
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Obsessive–compulsive disorder (OCD) is amental disorder where people feel the need to check things repeatedly, perform certain routines repeatedly (called "rituals"), or havecertain thoughts repeatedly. People are unable to control either the thoughts or the activities for more than a short period of time.
One of the most reported benefits of effective mediation is the increase in positive emotion. When you meditate successfully, you are more likely to approach life in a different perspective with more optimism and relaxation instead of stress and anxiety.
I would say either Psycho-surgery, or Electroconvulsive therapy. :)
