In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

[EX Q]: Question: Which enzyme uses FAD as a coenzyme? 
 Options:  <1> Isocitrate dehydrogenase. <2> Glucose 6-phosphate dehydrogenase. <3> Succinate dehydrogenase. <4> Malate dehydrogenase. <5> Lactate dehydrogenase.
[EX A]: 3

[EX Q]: Question: If metallic copper is added to a solution of iron (III) chloride, it produces: 
 Options:  <1> A precipitate of copper (II) chloride. <2> A solution of copper (II) chloride and iron (II) chloride. <3> A precipitate of iron (II) chloride. <4> A precipitate of metallic iron. <5> A solution of copper (I) chloride and iron (II) chloride.
[EX A]: 2

[EX Q]: Question: The neurofibrillary tangles are anomalous structures that are observed in Alzheimer's patients and that consist of: 
 Options:  <1> Neurons in process of extinction by accumulations of intertwined filaments of tau protein that alter the transport of substances in the cytoplasm. <2> Extracellular deposits containing a nucleus of beta-amylase protein surrounded by degenerating axons and dendrites. <3> Proteins that serve to facilitate the production and transport of a cerebral neurotropic factor. <4> Accumulation of astrocytes and microgliocytes with the ability to react to external pathogens. <5> Proteins produced by a defective gene that increases the likelihood of Parkinson's disease.
[EX A]:
1