You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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'.

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
Why? The answer to the given question should be a tumor, therefore Wilms tumor is the correct answer for the given question.

New input: Question: In the technique of analysis by injection in flow:
Options: <1> A relatively large volume of sample is injected into the system, obtaining signals at steady state. <2> A small volume of sample whose integrity is maintained by segmentation with air bubbles is introduced. <3> The sample maintains its integrity throughout the process as it is available in separate containers. <4> The responses obtained have a peak shape whose height depends on the concentration of the sample. <5> The main difficulty lies in the slowness of the measures.
Solution:
4