Medulla oblongata of the patient is affected.
C. Medulla oblongata
Explanation:
A long stem like structure called medulla oblongata is present in the lower portion of the brainstem. The medulla oblongata is responsible for effective functioning of heart and blood vessel. The breathing rate is regulated by medulla oblongata. Sneezing, digestion and swallowing are some of the functions controlled by the medulla oblongata.
The patient is diagnosed with breathing problem and fluctuation in blood pressure and heart rate, so obviously the medulla oblongata of the patient would be affected.
