Which of the following are the functions thyroxine?
A) It increases the rate of metabolism
B) It promotes growth and differentiation of tissues.
C) It regulates iodine and sugar level in the blood.
D) It controls working of kidneys and urine output.

Explanation

To determine the functions of thyroxine, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Thyroxine**:
- Thyroxine is a hormone secreted by the thyroid gland. It plays a crucial role in regulating various bodily functions.

2. **Analyzing Option A**:
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