Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'neck of urinary bladder'?

A. The thick outer layer of the adrenal gland that produces and secretes steroid hormones such as corticosterone, estrone and aldosterone.
B. The constricted portion of the urinary bladder, formed by the meeting of its inferolateral surfaces proximal to the opening of the urethra[MP].
C. An orbitosphenoid bone or its cartilage or pre-cartilage precursor.
D. The jelly-like substance in the middle of the spinal disc which is a remnant of the notochord.

Answer: The constricted portion of the urinary bladder, formed by the meeting of its inferolateral surfaces proximal to the opening of the urethra[MP].