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 a 29-year-old woman the following parameters are in the course of a routine analysis: Hb 11.5 g / dL, VCM 70 fl, HCM 28 pg, Ferritin 10 ng / mL, leukocytes 5,200 / mm3, platelets 335,000 / mm3. Physical examination is normal. The most indicated exploration in this situation is: 
 Options:  <1> Gynecological exploration. <2> Study of occult blood in stool. <3> Radiological study of the digestive system. <4> Electrophoresis of hemoglobins. <5> Test of Coombs.
Solution:
1