The hormone of the thymus gland which hastens the attainment of sexual maturity is

Options

A. Thymosin
B. Thymopoietin
C. Thymulin
D. All of these

Answer

To solve the question regarding the hormone of the thymus gland that hastens the attainment of sexual maturity, we can follow these steps:

### Step 1: Identify the Thymus Gland
The thymus gland is a specialized organ located in the upper chest, and it plays a crucial role in the immune system, particularly in the development of T-cells.

**Hint:** Remember that the thymus is primarily associated with immune function and the maturation of T-cells.

### Step 2: Understand the Hormones Secreted by the Thymus
The thymus gland secretes several hormones, including thymosin, thymopoietin, and thymulin (sometimes referred to as thymoline). Each of these hormones has specific roles in the immune system and development.

**Hint:** Focus on the specific hormones produced by the thymus and their functions related to T-cell development and maturation.

### Step 3: Analyze the Options
1. **Thymosine**: Known to stimulate the development and differentiation of T-cells and is associated with hastening sexual maturity.
2. **Thymopoietin**: Also plays a role in T-cell development and maintaining youthful function, contributing to sexual maturity.
3. **Thymoline**: A polypeptide hormone that induces proliferation of lymphocyte precursors and differentiation of T-lymphocytes, aiding in sexual maturity.
4. **All of the above**: This option suggests that all the listed hormones contribute to hastening sexual maturity.

**Hint:** Consider the roles of each hormone and how they relate to sexual maturity.

### Step 4: Determine the Correct Answer
Since all three hormones (thymosin, thymopoietin, and thymoline) contribute to the development of T-cells and hasten sexual maturity, the correct answer is option 4, which includes all the hormones mentioned.

**Hint:** When faced with multiple correct answers, look for the option that encompasses all relevant information.

### Final Answer
The hormone of the thymus gland which hastens the attainment of sexual maturity is **option 4: All of the above** (thymosin, thymopoietin, and thymoline).