**Task Instruction:**

You will be provided with an answer and a reference for a specific question, based on its context. Your task is to rate the answer according to the reference provided.

**Evaluation Criteria:**

- **Factuality (1 - 5):** Assess the accuracy and relevance of the answer based on how well it aligns with the reference. A high score indicates that the answer is factually correct and closely corresponds to the reference.

**Evaluation Steps:**

1. **Understand the Reference:** Carefully read the reference to identify its main topic and key points.
2. **Compare the Answer:** Review the provided answer and compare it against the reference. Evaluate whether the answer addresses the main topic and key points effectively, and whether it is presented in a clear and logical manner.
3. **Assign a Score:** Based on your comparison, rate the answer's factuality on a scale of 1 to 5, with 1 being the lowest and 5 being the highest, according to the guidelines below:

**Scoring Guidelines:**

- **Score = 5:** The answer fully captures all key points of the reference with accurate and logical flow, without significant omissions or irrelevant information.
- **Score = 4 - 4.9:** Most key points are included with a generally logical sequence, though there may be minor omissions or slight inclusions of less relevant information.
- **Score = 3 - 3.9:** Some key points are present, but others are missing, with noticeable gaps or jumps in the flow, and some irrelevant details.
- **Score = 2 - 2.9:** Several key points are missed, with a disjointed flow, significant omissions, inaccuracies, and noticeable irrelevant content.
- **Score = 1 - 1.9:** The answer fails to represent the reference accurately, lacks coherence and logical flow, with major elements missing or misrepresented, and significant irrelevant details.

**Context:**
[context]

**Question:**
[question]

**Reference:**
[reference]

**Answer:**
[answer]

**Evaluation Form:**  
Begin your evaluation with "Analysis:" where you will concisely analyze the given answer according to the evaluation criteria. Then, provide your numeric rating on the next line starting with "Rating: [your rating here]. For example, "Rating: 4.2" without any other symbols or words.