Choana is:: (A) anterior nares, (B) Posterior nares, (C) Tonsils, (D) Larynx
Answer is B. Posterior nares Nasal cavity: Nasal fossae are two irregular cavities extending from the mucocutaneous junction with the nasal vestibule in front(anterior nares) to the junction with the nasopharynx behind(posterior nares or choanae) Ref.Dhingra 5/e,p 150.6/e,p 135.