*Question G2A11:
Generally, who should respond to a station in the contiguous 48 states calling “CQ DX”?*  

*Correct Answer is  C: Any stations outside the lower 48 states*  

### AI Response: (may contain errors)  

When a station in the contiguous 48 states calls "CQ DX," they are specifically inviting responses from stations located outside of the lower 48 states. Here's a breakdown of the correct answer and why the other options are incorrect:

### Correct Answer: C - Any stations outside the lower 48 states
- **Explanation**: The term "DX" refers to long-distance communication, typically involving stations that are not in the same geographic area. When a station calls "CQ DX," they are looking to make contacts with stations that are outside the contiguous United States, which includes territories and countries beyond the lower 48 states.

### Why the Other Choices are Incorrect:
- **A: Any caller is welcome to respond**  
  - **Explanation**: While technically any station can respond, the intent of the "CQ DX" call is to attract stations from outside the lower 48 states. Responding from within the contiguous U.S. is not in line with the purpose of the call.

- **B: Only stations in Germany**  
  - **Explanation**: This option is too restrictive. The call is not limited to any specific country; it is open to all stations outside the contiguous U.S., not just those in Germany.

- **D: Only contest stations**  
  - **Explanation**: This option is also incorrect because "CQ DX" is not limited to contest stations. It is an invitation for any station outside the lower 48 states to respond, regardless of whether they are participating in a contest.

### Summary
- "CQ DX" is a call for long-distance contacts, specifically targeting stations outside the contiguous U.S.
- Understanding the context of "DX" is crucial for responding appropriately to such calls.

This knowledge is essential for the Extra Class exam and for effective communication in amateur radio.