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'.

Input: Consider Input: Question: The type of epidemiological study indicated to evaluate, in a population initially exempt from the health problem under study, the association between a risk factor and the onset of the disease is: 
 Options:  <1> Randomized clinical trial. <2> Quasi experimental. <3> Ecological studies <4> Cases and controls study. <5> Cohort study.

Output: 3


Input: Consider Input: Question: In the parasympathetic system: 
 Options:  <1> The preganglionic neuron is in thoracic spinal cord. <2> Postganglionic neurons have short axons. <3> Postganglionic fibers release noradrenaline. <4> Postganglionic neurons have muscarinic receptors. <5> Numerous neurons innervate vascular smooth muscle of the extremities.

Output: 2


Input: Consider Input: Question: A 34-year-old woman is admitted to the hospital for pulmonary embolism confirmed by angio-CT. He has no history of recent surgery, trauma or travel. He refers to Raynaud's phenomenon for 2 years, and the previous year he had an abortion at 12 weeks of gestation. He has no family history of venous thromboembolic disease. The activated partial thromboplastin time is 56 sg (normal 25-35 sg) and the platelet count is 120000 / uL. Which of the following diagnostic tests would help you most in the diagnosis? 
 Options:  <1> Antithrombin III. <2> Lupus anticoagulant. <3> Factor V of Leiden. <4> Protein C. <5> Protein S.


Output: 2