Question: A 65-year-old woman with a history of joint pains treated with anti-inflammatories, who is referred for a study due to anemia. In the complementary studies it presents 3.164.000 red blood cells, Hto. 32%, Hb 11 g / dl, VCM 69 fl, Leukocytes 7800, Platelets 370,000, PCR 0.29 mg / dl, Fe 20 ng / ml, Ferritin 18 ng / ml, Glucose 105 mg / dl, GOT, GPT, GGT , F. Alkaline, total Bilirubin, Cholesterol, Creatinine, Calcium and Phosphorus normal. Ac. Anti-transglutaminase and negative antigliadin Ac. Gastroscopy: hiatus hernia of 3 cm, rest without alterations. Colonoscopy: up to blind, isolated diverticula in sigma. Intestinal transit without alterations. Ultrasound of the abdomen without alterations. Which of the explorations listed below do you find most appropriate to complete the study? 
 Options:  <1> Jejunal biopsy <2> Arteriography <3> Endoscopic capsule <4> Radioisotopes. <5> Pelvic MRI.
3