Growth of male secondary sex organs is stimulated by ……………. .

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about the hormone responsible for stimulating the growth of male secondary sex organs.

2. **Understand Male Secondary Sex Organs**: Male secondary sex organs include structures such as the prostate gland, seminal vesicles, and urethra. These organs are essential for male reproductive functions.

3. **Recognize the Role of Hormones**: Hormones play a crucial role in the development and regulation of secondary sex organs. In males, the primary hormone involved is testosterone.

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