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 antitumor agent cis-platinum:
Options: <0> It is a flat square complex of Pt (II) with 2 molecules of ammonia and 2 chloride anions located in cis. <1> It is a flat square complex of Pt (IV) with 2 molecules of ammonia and 2 chloride anions located in cis. <2> It is an octahedral complex of Pt (IV) with 2 molecules of ammonia in cis and 4 chloride anions in the other positions. <3> It is an octahedral complex of Pt (II) with 2 chloride anions in cis and 4 ammonia molecules in the other positions. <4> It is an alkene with two Pt atoms in the two cis positions with respect to the double bond.
A:
chemistry