You will be given a definition of a task first, then some input of the task.
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.

Question: In relation to clopidogrel, it is false that:
Options: <0> It is structurally related to thienopyridines. <1> It inhibits adenyl cyclase, and therefore increases cAMP levels. <2> It has a low index of myelotoxicity in relation to ticlopidine. <3> It has a longer action in relation to ticlopidine. <4> In case of surgical intervention, it is recommended to interrupt the treatment at least one week in advance.
Output:
pharmacology