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.
Example: Question: A distension is defined as: 
 Options:  <0> Soft tissue injury. <1> Forced movement of abrupt production. <2> Injury by stretching a muscle. <3> Injury of the joint capsule. <4> Interruption in the continuity of a bone.
Example solution: nursery
Example explanation: Distension means Bloating and swelling in the belly area. It does not have much to do with chemistry, psychology, pharmacology, biology and medicine. Hence, the correct topic is nursery.

Problem: Question: COMPLETE: in the Krebs cycle 4 oxidation reactions occur, in 3 of them the final acceptor electron is ___ and in the other is ___: 
 Options:  <0> FAD / FMN. <1> NAD + / FMN. <2> NADP + / FAD. <3> NAD + / FAD. <4> FAD / NAD +.

Solution: chemistry