Three tissue systems were first clasified by

Options

A. Schmidt
B. Hanstein
C. Sachs
D. Nageli

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks who first classified the three tissue systems in plants.

2. **Identify the Options**: The options provided are:
- Smith
- Hanstein
- Sacks
- Nageli

3. **Recall the Classification of Tissue Systems**: The three tissue systems in flowering plants are:
- Dermal Tissue System (Epidermal)
- Ground Tissue System (Cortical or Fundamental)
- Vascular Tissue System

4. **Determine the Correct Answer**: Based on biological knowledge, the first person to classify these three tissue systems was Sacks.

5. **Final Answer**: The correct answer is Sacks.

---