Q: What is the primary reproductive organ in males?  

Answer: B

The testis is the primary reproductive organ in males responsible for the production of sperm and testosterone. They are two oval-shaped structures that weigh around 10-14 grams, located inside the scrotum. The testes are composed of seminiferous tubules, which are responsible for sperm production, and Leydig cells, which produce testosterone. The testes are also involved in the process of spermatogenesis, where the germ cells undergo meiosis and differentiate into mature spermatozoa. Testosterone production by the testes also plays a crucial role in male sexual development and function, including the development of secondary sexual characteristics such as facial and body hair, deepening of the voice, and muscle mass.

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