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 Input:
Question: If, by adding a drop of H2O2 to a bacterial suspension, bubbles (O2) are generated, the bacteria produce: 
 Options:  <1> Cytochrome C oxidase. <2> Oxygenase <3> Superoxide dismutase. <4> Catalase <5> Anhydrase

Ex Output:
4


Ex Input:
Question: Pulmonary hypertension occurs as a consequence of: 
 Options:  <1> Bronchoconstriction and inflammation of the upper respiratory tract. <2> Bronchoconstriction and inflammation of the lower respiratory tract. <3> Bronchiectasis and pulmonary collapse. <4> Vasoconstriction of the arterioles of the systemic circulation. <5> Vasoconstriction of the arterioles of the pulmonary circulation.

Ex Output:
5


Ex Input:
Question: A potential receiver: 
 Options:  <1> It is produced by the opening of voltage-dependent channels. <2> Increase its frequency if the intensity of the stimulus increases. <3> It occurs after the binding of the neurotransmitter to the postsynaptic receptor. <4> They occur if the trigger threshold is exceeded. <5> It can be exciter or inhibitor.

Ex Output:

5