The acrosome of sperm is formed from

The correct option is Golgi complex of spermatid.

To understand why this is correct, let's break down the process of spermatogenesis and spermiogenesis:

1. Spermiogenesis:
Spermiogenesis is the final stage of spermatogenesis where non-motile, spherical spermatids are transformed into mature, motile spermatozoa (sperm cells). During this transformation, spermatids undergo significant morphological changes, including the condensation of the nucleus, the formation of the sperm tail (flagellum), and the creation of the acrosome.

2. Formation of the Acrosome:
The acrosome is a cap-like structure that covers the anterior half of the head of a mature spermatozoon. It contains hydrolytic enzymes (such as hyaluronidase and acrosin) that are essential for penetrating the outer membranes of the egg (oocyte) during fertilization.
During spermiogenesis, the Golgi complex of the spermatid undergoes polarization and fusion. Small, enzyme-rich vesicles produced by the Golgi complex merge to form a single large pre-acrosomal vesicle. This vesicle eventually flattens and spreads over the anterior pole of the condensing nucleus, forming the mature acrosomal cap.

3. Role of other organelles:
- Mitochondria of spermatid: These organelles aggregate in the middle piece (neck/body region) of the sperm to form a spiral sheath (nebenkern), providing energy (ATP) for sperm motility.
- Nucleus of spermatid: It undergoes extreme condensation to form the major portion of the sperm head, carrying the paternal genetic material.
- Centrosome of spermatid: The centrioles of the centrosome help in the formation of the axial filament of the sperm tail (flagellum).

Thus, the acrosome is specifically derived from the Golgi complex of the spermatid.