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'.

Q: Question: Sulfasalazine is used for the treatment of ulcerative colitis. It is a prodrug of 5-aminosalicylic acid that is activated by a process of: 
 Options:  <1> Hydrolysis of an ester. <2> Hydrolysis of an amide. <3> Oxidative dealkylation. <4> Reducing rupture of the azoderivative. <5> Aromatic hydroxylation.

A: 4
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Q: Question: What amino acids can be bound to a sugar by an O-glycosidic bond? 
 Options:  <1> Ser and Thr. <2> Cys and Ser. <3> Asn and Thr. <4> Lys and His. <5> Val and Leu.

A: 1
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Q: Question: The stimulation of the carotid bodies: 
 Options:  <1> Decreases the pH of arterial blood. <2> PCO2 decreases in arterial blood. <3> Increases the arterial concentration of bicarbonate. <4> Increases the urinary excretion of sodium. <5> Lowers blood pressure

A:
2
****