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: The reinforcement circuit can be activated by electrical stimulation of the mesolimbic system, originating in the ventral tegmental area and projecting: 
 Options:  <1> To the hippocampus, inhibiting the release of dopamine. <2> To the nucleus accumbens, causing release of dopamine. <3> To the prefrontal cortex, stimulating the release of glutamate. <4> A mesencephalic reticular formation, causing release of glutamate. <5> To the pituitary, inhibiting the release of dopamine.
[EX A]: 2

[EX Q]: 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:  <1> FAD / FMN. <2> NAD + / FMN. <3> NADP + / FAD. <4> NAD + / FAD. <5> FAD / NAD +.
[EX A]: 4

[EX Q]: Question: The most frequent cause of irreversible blindness in people over 60 is: 
 Options:  <1> Macular degeneration <2> Open angle glaucoma. <3> Diabetic retinopathy <4> Acute glaucoma. <5> Retinal detachment.
[EX A]:
1