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: The Grignard reagents attack the epoxides to give, after the appropriate hydrolysis: 
 Options:  <0> Carboxylic acids. <1> Cyclic amides. <2> Open aliphatic chains. <3> Open-chain alcohols. <4> Cyclic ethers.
[A]: pharmacology


[Q]: Question: Question linked to image # 1 In the previous patient, which of the following treatments is indicated? 
 Options:  <0> Biliary drainage through retrograde endoscopic and systemic chemotherapy. <1> Duodenopancretectomy cephalic with vascular resection. <2> Hepatic embolization with charged spheres of chemotherapy. <3> Bilirubic-hepatic bile drainage and systemic chemotherapy. <4> Treatment with corticoids.
[A]: medicine


[Q]: Question: How many macromolecular complexes form the electronic transport chain ?: 
 Options:  <0> 6 macromolecular complexes. <1> 5 macromolecular complexes. <2> 4 macromolecular complexes. <3> 3 macromolecular complexes. <4> 2 macromolecular complexes.
[A]:
pharmacology