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'.

[EX Q]: Question: The determination of cyanide by the Liebig method is based on the addition of a silver nitrate standard solution: 
 Options:  <1> Until complete precipitation of silver cyanide. <2> Until the precipitation of silver cyanide begins. <3> Until the appearance of a red precipitate of silver chromate. <4> Until the AgCN complex is quantitatively formed. <5> Until the precipitation of silver iodide, yellow.
[EX A]: 2

[EX Q]: Question: They are reservoirs of Q fever (Coxiella burnetti): 
 Options:  <1> Bats <2> Poultry. <3> Rodents <4> Dogs. <5> Cows, sheep and goats.
[EX A]: 5

[EX Q]: Question: A 26-year-old woman comes to the emergency room due to abdominal pain and scarce vaginal blood loss. It refers to an amenorrhea of ​​7 weeks. You perform a pregnancy test, with a positive result. What is the next step? 
 Options:  <1> Perform a vaginal ultrasound examination. <2> Recommend home rest and repeat the pregnancy test in a week. <3> Evacuate the uterus by curettage by aspiration. <4> Standard progesterone micronized vaginally until week 14 of gestation. <5> Evacuate the uterus by intravaginal administration of prostaglandins.
[EX A]:
1