A 58-year-old male presents with persistent fullness of left ear for 3 months and hearing loss. On examination, there is fluid behind the tympanic membrane. Impedance audiometry shows a type B audiogram. The next step for the management of the patient would be:
Myringotomy with grommet inseion Endoscopic examination for any nasopharyngeal pathology Valsalva manoeuvre Antihistaminics