For each of the following questions, four choices have been provided. Select the correct alternatives. Male sex hormone is produced by (a) Male gonad (b) Prostate gland (c) Testes (d) Both (a) and (c)

The primary male sex hormone responsible for the development and maintenance of male secondary sexual characteristics is testosterone.

Now, let's evaluate each of the options provided: (a) Male gonad - Gonads are primary reproductive organs, and male gonads refer to testes. Testes produce testosterone but specifying only male gonad may not be the complete answer. (b) Prostate gland - The primary function of the prostate gland is to secrete prostate fluid, a component of semen. While testosterone plays a role in its normal functioning, it does not produce it. (c) Testes - Testes produce testosterone, as mentioned above. Testes are male gonads and primary male sex organs. This option seems accurate, but we should also check the fourth option. (d) Both (a) and (c) - This option includes both male gonad and testes, both of which are responsible for producing testosterone. As we discussed earlier, male gonad refers to testes.

Based on the analysis in Step 2, it is evident that the correct option is (d) Both (a) and (c) since both male gonad and testes produce the male sex hormone, testosterone.