Abnormal rise in RBC count is called  

Options

A. Anaemia
B. hematoma
C. Polycythemia
D. Erythrocytopenia

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks for the term that describes an abnormal rise in the red blood cell (RBC) count.

2. **Identifying the Options:** The options given are:
- A) Anemia
- B) Hematoma
- C) Polycythemia
- D) Erythrocytopenia

3. **Analyzing Each Option:**
- **A) Anemia:** This condition is characterized by a decrease in the number of red blood cells or hemoglobin in the blood. Therefore, it does not relate to an increase in RBC count.
- **B) Hematoma:** This refers to a collection of blood outside of blood vessels, usually due to injury. It does not pertain to the RBC count directly.
- **C) Polycythemia:** This condition is defined as an increase in the number of circulating red blood cells in the blood. This matches the requirement of the question.
- **D) Erythrocytopenia:** This term refers to a deficiency or decrease in red blood cells, which is the opposite of what the question is asking.

4. **Conclusion:** Based on the analysis, the correct answer is C) Polycythemia, as it directly corresponds to an abnormal rise in RBC count.

**Final Answer:** The abnormal rise in RBC count is called **Polycythemia**.

---