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: Under the name of xanthines are grouped: 
 Options:  <1> The coca leaf, cocaine and crack. <2> Methadone and heroin <3> The MDA and the MDMA. <4> Nicotine and inhalants. <5> Caffeine and theophylline.
[EX A]: 5

[EX Q]: Question: A colonoscopy of colorectal cancer screening is performed on a patient with ulcerative colitis with involvement up to the transverse colon. Colonoscopy shows no signs of inflammatory activity. Multiple biopsies were performed every 10 cm. The biopsies were reviewed by 2 expert pathologists demonstrating a focus of high grade dysplasia in one of the biopsies performed in the sigmoid colon. What would you indicate next? 
 Options:  <1> Repeat the colonoscopy to confirm the diagnosis. <2> Intensive surveillance with colonoscopy every 3 to 6 months. <3> Repeat the examination and perform a chromoendoscopy to identify the lesion and perform an endoscopic mucosectomy. <4> Total proctocolectomy. <5> Treatment with mesalazine at doses of 2-3 grams per day and repeat the scan at 3 to 6 months.
[EX A]: 4

[EX Q]: Question: The majority of regulatory T lymphocytes express high levels of: 
 Options:  <1> Molecules of the B7 family. <2> CD8. <3> The alpha chain of the receptor for IL-2. <4> IL-17. <5> Perforin
[EX A]:
3