Detailed Instructions: 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'.
See one example below:
Problem: Question: A 13-year-old girl is operated on due to Hirschsprung illness at 3 months of age. Which of the following tumors is more likely to be present?
Options: <1> Abdominal neuroblastoma <2> Wilms tumor <3> Mesoblastic nephroma <4> Familial thyroid medullary carcinoma.
Solution: 2
Explanation: The answer to the given question should be a tumor, therefore Wilms tumor is the correct answer for the given question.

Problem: Question: The thermal conductivity detector was one of the first used in gas chromatography and still has a lot of application. Consists in:
Options: <1> A source that is heated by electricity, whose temperature at a constant electrical energy depends on the thermal conductivity of the gas that surrounds it. <2> A metallic surface on which ions collide, producing emission of electrons or other ions, with the consequent variation in conductivity. <3> An air / hydrogen flame where organic compounds are pyrolyzed producing ions that lead to a change in conductivity. <4> An emitter of beta radiation that allows the measurement of the conductivity of the eluent that leaves the chromatographic column. <5> A source of thermal ionization that produces positive and negative ions that change the conductivity of the gas passing through the detector.
Solution:
1