How can the option "Female" be preselected in the following form?

<form action="process.php" method="POST">
  <label>Gender:</label>
  <input type="radio" id="male" name="gender" value="male">
  <label for="male">Male</label>
  <input type="radio" id="female" name="gender" value="female" checked>
  <label for="female">Female</label>
  <button type="submit">Send</button>
</form>