Identify the disease caused due to hyposecretion of thyroxine hormone.

Options

A. Hyperthyroidism
B. Exophthalmic goitre
C. Myxoedema in adults
D. Both (a) and (b)

Explanation

**Step-by-Step Solution:**

1. **Understanding Thyroxine Hormone**: Thyroxine is a hormone produced by the thyroid gland that plays a crucial role in regulating metabolism, growth, and development.

2. **Defining Hyposecretion**: Hyposecretion refers to the insufficient production of a hormone. In this case, we are looking for a disease caused by low levels of thyroxine.

3. **Analyzing Options**:
- **Option A: Hyperthyroidism**: This condition is characterized by the overproduction of thyroxine. Therefore, it is not related to hyposecretion. (Incorrect)
- **Option B: Exophthalmic Goiter**: This condition also involves the overproduction of thyroxine, leading to symptoms such as bulging eyes. Hence, it is not caused by hyposecretion. (Incorrect)
- **Option C: Myxedema**: This is a condition that occurs due to the deficiency of thyroxine in adults. It is characterized by symptoms such as swelling of the skin and tissues. (Correct)
- **Option D: Both A and B**: Since both options A and B are incorrect, this option is also incorrect.

4. **Conclusion**: After analyzing all the options, the disease caused by the hyposecretion of thyroxine hormone is **Myxedema** in adults.

**Final Answer**: Myxedema in adults.

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