Select the incorrect statement.

Options

A. Benign tumors lack contact inhibition.
B. Monitoring the blood banks reduces the chances of spreading AIDS .
C. Opioids are obtained from poppy plant.
D. CT scanning is commonly used as a diagnostic test for detecting AIDS.

Answer

To solve the question of selecting the incorrect statement, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: "Banning tumors like contact inhibition."**
- **Analysis:** Contact inhibition is a process where non-cancerous cells stop dividing when they come into contact with each other. This is a characteristic of normal cells, not tumors. Tumors, especially cancerous ones, do not exhibit contact inhibition and continue to grow uncontrollably. Therefore, this statement is **true**.

2. **Statement B: "Monitoring the blood banks reduces the chances of spreading AIDS."**
- **Analysis:** Regular monitoring and testing of blood banks are crucial in preventing the transmission of HIV/AIDS through blood transfusions. Ensuring that blood is screened for HIV significantly reduces the risk of spreading the disease. Thus, this statement is **true**.

3. **Statement C: "Opioids are obtained from the poppy plant."**
- **Analysis:** Opioids, including morphine and codeine, are indeed derived from the resin of the opium poppy plant (Papaver somniferum). This statement is also **true**.

4. **Statement D: "CT scanning is commonly used for diagnostic tests for detecting AIDS."**
- **Analysis:** CT scans are imaging techniques used primarily to visualize internal structures, such as organs and bones. They are not used to diagnose AIDS, which is typically diagnosed through blood tests that detect HIV antibodies or the virus itself. Therefore, this statement is **false**.

### Conclusion:
The incorrect statement is **Statement D**: "CT scanning is commonly used for diagnostic tests for detecting AIDS."