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'.

Q: Question: A biosensor consists of: 
 Options:  <1> A receiver, a transducer, and an enzymatic brand. <2> A receptor and an enzymatic brand. <3> A transducer and an enzymatic brand. <4> A receiver and a transducer. <5> A receptor and an antibody.

A: 4
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Q: Question: In relation to the physiology of the complement system, one of the following statements is false: 
 Options:  <1> Most of its components are inactive. <2> Its mode of activation is similar to the coagulation cascade. <3> It is subject to strict control of regulatory mechanisms. <4> It is only activated by two different routes: the classical and the alternative. <5> During its activation, multimolecular complexes are formed.

A: 4
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Q: 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.

A:
3
****