The current scientific definition of the hormone is

Options

A. Hormone is a chemical produced by endocrine glands and released into blood and transported to distantly located target organ.
B. Hormones are non-nutrient chemicals which acts intercellular messengers and are produced in trace amounts
C. Hormones are non-nutrient chemicals which acts intracellular messengers and are produced in trace amounts
D. Both B and C

Explanation

### Step-by-Step Solution

1. **Understanding Hormones**: Hormones are chemical substances produced by various glands in the body. They play a crucial role in regulating physiological processes and maintaining homeostasis.

2. **Identifying the Options**: The question provides several definitions of hormones. We need to analyze each option to determine which one aligns with the current scientific understanding.

3. **Evaluating Option A**: The first option states that hormones are chemicals produced by endocrine glands and released into the blood to reach target organs. While this is true, it is considered a classical definition and does not encompass the full scope of what hormones are today understood to be.

4. **Evaluating Option B**: The second option describes hormones as non-nutrient chemicals that act as intercellular messengers and are produced in trace amounts. This definition captures the essence of hormones as signaling molecules that function at low concentrations, making it the most accurate and current scientific definition.

5. **Evaluating Option C**: The third option is similar to option B but incorrectly states that hormones are "intercellular" instead of "intercellular messengers." This mischaracterization makes this option incorrect.

6. **Final Evaluation**: The last option states that both B and C are correct. Since option C is incorrect, this option is also invalid.

7. **Conclusion**: The most accurate and current scientific definition of a hormone is provided in option B: "Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts."