This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Anatomical features of prostatic Urethra are following except - 
Select and explain. 
A. Trapezoidal shape on cross-section, B. Presence of mucosal elevation- the verumontanum, C. Opening of Prostatic ducts, D. Urethral Crest on posterior wall
A: Trapezoidal shape on cross-section
Answer: A: Trapezoidal shape on cross-section 
Explanation: Urethra
-        Length
o   Male- 20 cms
o   Female- 4 cms
-        Shortest part of the male urethra- Membranous part
-        The longest part of the male urethra- Penile urethra
-        Location of sphincter urethrae- Membranous part
-        Prostatic urethra
o   Widest part
o   Most dilatable part
o   Concave anteriorly.
o   Route- downwards & forwards. Exit prostate slightly anterior to its apex.
o   Crescentic on the cross section
o    Structures on the posterior wall
§  Urethral crest
§  Colliculus seminalis (verumontanum)
§  Opening of ejaculatory ducts
§  Prostatic sinuses with the opening of prostate glands
o   Lymphatics
§  Membranous part- Internal iliac nodes
§  Prostatic part- Internal iliac nodes
§Penile urethra- Deep inguinal nodes.