I don't think you mean above the medula oblongata, i think you mean something else because the connection between the two hemispheres is connected by the Corpus Callosum which is above of the thalamus.
The only answer that i can make sense of what you've wrote is A Cerebellum but i don't think you are correct forming your question. Where did you find the question
What do you mean can you explain more in detail please
Doing a regular body check-up can help doctors diagnose a disease before it poses high risk. Reduces the risk of complication during treatment – once you are diagnosed with a health condition at an early stage, the complexity and risk involved are less when compared to diagnosing at a very late stage.