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: Which of the following enzyme complexes catalyzes the reduction of molecular oxygen to water during oxidative phosphorylation?
Options: <1> ATP synthase. <2> Cytochrome c oxidase. <3> NADH-Q oxide-reductase. <4> Q-cytochrome c-oxide-reductase. <5> Succinate-Q reductase.

Ex Output:
2

Ex Input:
Question: Which of the following skin diseases is associated with celiac disease?
Options: <1> Atopic dermatitis. <2> Dermatitis herpetiformis <3> Molluscum contagiosum. <4> Annular granuloma. <5> Rosacea

Ex Output:
2

Ex Input:
Question: The Baeyer-Villiger oxidation is an important procedure to transform ketones into:
Options: <1> Acids <2> Aldehydes. <3> Esters. <4> Ethers <5> Alquenos

Ex Output:
3