Final answer:
Oxygen therapy is the medication that can be given for a severe case of hyperventilation.
Step-by-step explanation:
Oxygen therapy can be given for a severe case of hyperventilation. While sedatives and antianxiety medications can help reduce anxiety and panic attacks, they are not typically used as the first line of treatment for hyperventilation. These medications are generally reserved for managing symptoms associated with anxiety disorders, not specifically for hyperventilation. Therefore, the correct answer is 1) Oxygen therapy.