**Core Concept**
Cytopathology is a branch of pathology that deals with the examination of cells to diagnose and study diseases. It involves the microscopic examination of cells, usually from body fluids or tissues, to detect abnormal cell changes or cancerous cells.

**Why the Correct Answer is Right**
The primary goal of cytopathology is to identify abnormal cells, which can indicate the presence of cancer or other diseases. This is achieved by examining the cellular morphology, including the shape, size, and arrangement of cells, as well as their nuclear features. Cytopathologists use specialized staining techniques and microscopic examination to make these assessments. In many cases, cytopathology is used in conjunction with histopathology to provide a comprehensive diagnosis.

**Why Each Wrong Option is Incorrect**
**Option A:**
* This is incorrect because while histopathology deals with the examination of tissues, cytopathology focuses specifically on cells.

**Option B:**
* This is incorrect because molecular pathology involves the use of molecular techniques to diagnose and study diseases, but it is not equivalent to cytopathology.

**Option C:**
* This is incorrect because radiology involves the use of imaging techniques, such as X-rays and MRIs, to diagnose and study diseases, but it is not related to cytopathology.

**Clinical Pearl / High-Yield Fact**
One key aspect of cytopathology is the importance of sampling adequacy, as a sample that is too small may not provide sufficient information for a diagnosis. This highlights the need for careful collection and handling of specimens in cytopathology.

**Correct Answer: A. Examination of cells.**