This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Head of sperm is derived from: 
Select and explain. 
A. Golgi Body., B. Nucleus, C. Mitochondria., D. Centromere
B: Nucleus
Answer: B: Nucleus 
Explanation: Ans. B. NucleusThe spermatozoon consists of head, neck, and tail. The tail is further divided into three parts: middle piece, principle piece, and end piece.a. The head mainly consists of a nucleus that contains the condensed chromatin material (mostly DNA).b. Anterior two-third of the nucleus is covered by an acrosomal cap that contains various enzymes including hyaluronidase and acrosin.c. Neck contains a funnel-shaped basal plate and a centriole. The centriole gives rise to axial filament that extends throughout the tail.d. Middle piece contains the axial filament in the center that is surrounded by spirally arranged mitochondrial sheath.