Final answer:
An exam of the 'UGI' means an examination of the upper gastrointestinal (GI) tract, specifically the esophagus and stomach.
Step-by-step explanation:
When a doctor orders an exam of the "UGI," they are referring to an exam of the upper gastrointestinal (GI) tract, which includes the esophagus, and stomach. This type of exam can be performed using various methods such as endoscopic ultrasound, where a probe is used to create images of the abdomen's organs including the detection of gallstones; or through an endoscope, where a tiny camera is inserted through a tube to examine the patient's upper GI tract for issues like peptic ulcers. From the given options, the correct answer to what an UGI examination involves is A) Stomach and esophagus.