Name the drug which is useful analgesic in patients undergoing surgery
(a) Chloropromazine
(b) Barbiturates
(c) Amphetamine
(d) Morphine

Options

A. Chloropromazine
B. Barbiturates
C. Amphetamine
D. Morphine

Answer

To solve the question, "Name the drug which is useful analgesic in patients undergoing surgery," we need to identify which of the given options is an analgesic, specifically for surgical patients.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a drug that is an analgesic, meaning it is used to relieve pain, particularly in patients undergoing surgery.

2. **Analyze Each Option**:
- **(a) Chloropromazine**: This is an antipsychotic medication used to treat mental disorders. It does not have analgesic properties, so this option is incorrect.
- **(b) Barbiturates**: These are central nervous system depressants that act as sedatives or hypnotics. They induce sleep but do not relieve pain, making this option incorrect.
- **(c) Amphetamine**: This is a stimulant that affects the central nervous system. It is not used for pain relief, so this option is also incorrect.
- **(d) Morphine**: This is a natural opiate derived from the opium poppy. Morphine is well-known for its analgesic properties and is commonly used to relieve pain in patients, especially during and after surgery.

3. **Conclusion**: Based on the analysis, the correct answer is **(d) Morphine**, as it is the only drug listed that acts as an analgesic.

### Final Answer:
**(d) Morphine**