Create a form in HTML that allows users to answer multiple-choice questions.
<form>
  <h2>Multiple Choice Questions</h2>
  <p>Q1. Which of the following are mammals?</p>
  <label><input type="radio" name="question1" value="a">a. Human</label><br>
  <label><input type="radio" name="question1" value="b">b. Fish</label><br>
  <label><input type="radio" name="question1" value="c">c. Parrot</label><br>
  <label><input type="radio" name="question1" value="d">d. Snake</label><br>
  <p>Q2. Who is the president of France?</p>
  <label><input type="radio" name="question2" value="a">a. Angela Merkel</label><br>
  <label><input type="radio" name="question2" value="b">b. Recep Tayyip Erdogan</label><br>
  <label><input type="radio" name="question2" value="c">c. Joe Biden</label><br>
  <label><input type="radio" name="question2" value="d">d. Emmanuel Macron</label><br>
  <input type="submit" value="Submit">
</form>