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There are several ways to return the response from an asynchronous call, depending on the programming language and framework you are using. Here are a few common approaches:

1. Callbacks: You can pass a callback function as a parameter to the asynchronous function. The function will be called with the response as an argument when the response is available.

function getData(callback) {
  setTimeout(() => {
    callback('hello world')
  }, 1000);
}

getData((response) => {
  console.log(response); 
})

2. Promises: In JavaScript, you can use Promises to handle asynchronous behavior. A promise is an object that represents the eventual completion or failure of an asynchronous operation. You can use the .then() method to attach a callback to a promise that will be called with the response when it is available.

function getData() {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve('hello world');
    }, 1000);
  });
}

getData().then((response) => {
  console.log(response);
});

3 Async/Await: You can use the async/await syntax to handle asynchronous operations in a synchronous-looking way.

async function getData() {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve('hello world');
    }, 1000);
  });
}

async function main() {
  const response = await getData();
  console.log(response);
}

4. C# await: A similar approach to JavaScript’s, you can use the await keyword to wait for an asynchronous operation to complete and return its result.

async Task<string> getData()
{
    await Task.Delay(1000);
    return "hello world";
}

You can choose the way you want to use it, but it is important to understand that the point is to return the response after the asynchronous process finishes.