Q: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Question: A 55-year-old man, the father of a celiac son, with iron deficiency anemia and a recent increase in the rhythm of deposition, has been determined to have a negative HLA-DQ2 and HLADQ8 allele. Which diagnostic study is the most appropriate in this case?
Options: <0> Determination of IgA anti-transglutaminase antibodies. <1> Upper digestive endoscopy with taking of duodenal biopsies. <2> D-xylose test. <3> Evaluate the response to a gluten-free diet. <4> Colonoscopy
A:
medicine