In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

[EX Q]: Question: Which of the following molecules has a simple covalent bond? 
 Options:  <1> C2. <2> N 2 <3> O 2 <4> O 3. <5> F 2
[EX A]: 5

[EX Q]: Question: One of the signs that can appear in the postoperative period is tympanism, which means: 
 Options:  <1> Paralysis of intestinal peristalsis. <2> Tympanic perforation due to increased pressure. <3> Evisceration <4> Retention of gases in the intestine. <5> Severe abdominal pain.
[EX A]: 4

[EX Q]: Question: The initial procedure of choice to investigate a possible obstruction of the biliary tract is: 
 Options:  <1> Hepatobiliary ultrasound. <2> Endoscopic retrograde cholangiopancreatography (ERCP). <3> Colangio Magnetic Resonance. <4> Computed tomography. Abdominal CT <5> Percutaneous transhepatic cholangiography.
[EX A]:
1