Answer: Trachea
Step-by-step explanation:
The Eustachian tube is also known as auditory tube which connects the nasopharynx to the middle ear. It is a part of middle ear.
The fauces is a part of the oropharynx which directly opens in the oral cavity as a sub division. It is superiorly bounded to the soft palate.
Esophagus is a muscular tube which is a connecting link in between pharynx and stomach.
Hence, trachea is not an opening found in the pharynx.