The use of chemicals for treatment of diseases is called as :

Options

A. chemotherapy
B. physiotherapy
C. angiotherapy
D. polytherapy .

Answer

To solve the question "The use of chemicals for treatment of diseases is called as:", we will analyze the options provided and identify the correct term.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for the term that describes the use of chemicals specifically for the treatment of diseases.

2. **Analyzing the Options**:
- **Option A: Chemotherapy**: This term refers to the use of chemical substances to treat diseases, particularly cancer. It involves the administration of drugs that target rapidly dividing cells.
- **Option B: Physiotherapy**: This is a treatment method that uses physical techniques, such as exercise and massage, rather than chemicals.
- **Option C: Angiotherapy**: This term is not commonly used and generally refers to treatments related to blood vessels, but it does not specifically involve chemicals for disease treatment.
- **Option D: Polytherapy**: This refers to the use of multiple medications or therapies to treat a condition, but it does not specifically denote the use of chemicals.

3. **Identifying the Correct Answer**:
- Based on the definitions and the context of the question, the correct answer is **Option A: Chemotherapy**. This is because chemotherapy specifically involves the use of chemical agents to treat diseases, primarily cancer.

4. **Final Answer**:
- The use of chemicals for treatment of diseases is called **Chemotherapy**.