Assertion : Morphine is very effective and sedative painkiller.
Reason : It is very useful for the patients who have depression.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion**: The assertion states that "Morphine is a very effective and sedative painkiller."
- Morphine is indeed a powerful analgesic (pain reliever) that is derived from the opium poppy. It is widely used in medical settings, particularly for managing severe pain, such as after surgery or in cases of chronic pain.

2. **Understanding the Reason**: The reason provided is that "It is very useful for the patients who have depression."
- While morphine is effective for pain relief, it is not typically used as a treatment for depression. In fact, opioids like morphine can sometimes lead to mood changes or exacerbate depression in some individuals.

3. **Evaluating the Truth of the Assertion and Reason**:
- The assertion is true because morphine is an effective painkiller.
- The reason is false because morphine is not used to treat depression.

4. **Conclusion**: Based on the evaluation, the assertion is true, but the reason is false. Therefore, the correct answer is that the assertion is true, and the reason is false.

**Final Answer**: Assertion is true, Reason is false (Answer C).

---