In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Q: Question: Which of the following statements about aging corresponds to the psychosocial approach known as Theory of Continuity?
Options: <0> Well-being in old age depends on newly acquired roles. <1> Aging successfully is related to the number of activities that are carried out. <2> As you get older it is necessary to voluntarily abandon certain activities. <3> Aging in a healthy way implies not dissociating from social roles. <4> The level of activity in old age is a function of the person's life trajectory.

A: nursery
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Q: Question: Liquid chromatography using linked stationary phases can be divided into normal phase and reverse phase phases. In this context it can be said that:
Options: <0> The main separation mechanism in reverse phase is the distribution, while adsorption also plays a very important role in the normal phase. <1> In normal phase chromatography, a large number of non-polar stationary phases can be used. <2> The main separation mechanism in normal phase is the distribution, while the adsorption plays a very important role in the reverse phase. <3> In reverse phase chromatography, the stationary phase is polar and the non-polar eluents. <4> In reverse phase chromatography, a large number of polar stationary phases can be used.

A: chemistry
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Q: Question: What is a prodrug?
Options: <0> A drug of series of a therapeutic class. <1> A drug that has been withdrawn from the market. <2> An inactive product that is enzymatically converted to an active drug. <3> A compound of natural origin from which one or more drugs are obtained by hemisynthesis. <4> A drug that lacks activity but enhances the action of others.

A:
medicine
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