Final answer:
For monitored anesthesia care (MAC) cases, the typical oxygen source provided to patients is a Nasal Cannula. This device delivers a low to moderate level of oxygen through the nostrils and is suitable for patients who can breathe unassisted during minor procedures. The correct answer is A).
Step-by-step explanation:
The oxygen source typically provided to patients undergoing monitored anesthesia care (MAC) is a Nasal Cannula (A). A nasal cannula is a device used to deliver supplemental oxygen or increased airflow to a patient in need of respiratory help, and it consists of a lightweight tube with two prongs that are placed in the nostrils. It is suitable for patients who require a low to moderate level of oxygen and can breathe on their own during minor surgical procedures under MAC. Options B (Simple Face Mask), C (Non-Rebreather Mask), and D (Laryngeal Mask Airway) are used in different clinical scenarios and provide varying levels of oxygen delivery, but for MAC cases, the nasal cannula is the most common choice providing adequate and comfortable oxygen delivery without obstructing access to the patient's head and face as a mask or airway device would.