Answer: Middle Ear
Explanation:
Ear is one of the most important part of human body by which an individual is able to hear sounds. It also helps in maintaining pressure inside body.
The Eustachian tube found inside the ear is a canal which is connects middle ear to the nasopharynx. This area consists of back of nasal cavity and the upper throat.
Its main function is to control the pressure within the middle ear, making it equal to the pressure outside the body.
Hence, the correct answer is option A
