Assertion A beam of charged particles is employed in the treatment of cancer
Reson Charged particles on passing through a material medium lose their energy by causing ionization of the atoms along their path.

Options

A. Both assertin and reason are true and reason is the correct explanation of assertion
B. Both assertion and reason are true but reason is not the correct explanation of assertion
C. Assertion is true but reason is flase
D. Both assertion and reason are false

Explanation

To solve the question regarding the assertion and reason about the use of charged particles in cancer treatment, we can break it down into the following steps:

### Step 1: Understand the Assertion
The assertion states that a beam of charged particles is employed in the treatment of cancer. This is true as charged particles, such as protons or heavy ions, are used in radiation therapy to target and destroy cancer cells.

**Hint:** Think about the types of radiation therapy used in cancer treatment.

### Step 2: Understand the Reason
The reason provided explains that charged particles lose their energy by causing ionization of the atoms along their path when they pass through a material medium. This is also true, as the ionization process is a key mechanism by which charged particles deposit energy in tissues.

**Hint:** Consider how ionization affects the atoms in the cancerous tissue.

### Step 3: Analyze the Relationship Between Assertion and Reason
The assertion and reason are related. The assertion discusses the application of charged particles in cancer treatment, while the reason explains the mechanism (ionization) through which these particles interact with the cancer cells.

**Hint:** Reflect on how the process of ionization contributes to the effectiveness of the treatment.

### Step 4: Conclusion
Both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, the correct conclusion is that both statements are true and the reason supports the assertion.

**Hint:** Summarize the findings to reinforce the relationship between the assertion and reason.

### Final Answer
Both the assertion and reason are true, and the reason correctly explains the assertion.