This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
Pseudosulcus in larynx is 
Select and explain. 
A. Laryngopharangeal reflux, B. Vocal abuse, C. Chronic steroid use, D. Tuberculosis
A: Laryngopharangeal reflux
Answer: A: Laryngopharangeal reflux 
Explanation: Laryngeal pseudosulcus refers to edema of the ventral surface of the true vocal fold that extends from the anterior commissure to the posterior larynx. Patients with pseudosulcus are nearly 2.5 times more likely to have pH-documented Larynopharyngela reflux.