Histology deals with the study of

Options

A. structures which can be discerned with naked eye
B. tissues
C. cells
D. changes in form and structure during development.

Answer

**Step-by-Step Solution:**

1. **Understanding Histology**: Histology is a branch of biology that focuses on the microscopic structure of tissues. It involves examining tissues to understand their structure and function.

2. **Identifying the Options**: The question provides four options:
- A) Structure visible to the naked eye
- B) Tissues
- C) Cells
- D) Changes in form and structure

3. **Analyzing Each Option**:
- **Option A**: This refers to structures that can be seen without a microscope, which is not the focus of histology.
- **Option B**: This directly refers to tissues, which is the primary subject of histology.
- **Option C**: While histology involves cells, it is specifically concerned with how these cells are organized into tissues.
- **Option D**: Changes in form and structure can relate to various fields, but histology specifically studies tissues rather than changes.

4. **Conclusion**: Since histology is specifically the study of tissues, the correct answer is **Option B: Tissues**.