instruction:
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'.
question:
Question: The cyclic electronic flow of photosynthesis: 
 Options:  <1> It uses the components of photosystem II together with plastocyanin and cytochrome b6f. <2> Generates ATP and NADPH. <3> It occurs in situations in which NADPH is in short supply. <4> It generates ATP without reducing NADP +. <5> Free O2.
answer:
4


question:
Question: We want to study if Vitamin D can increase the incidence of breast cancer. In our area we have a population registry of cancer. To achieve our goal, all women diagnosed with breast cancer are selected from the register we have and each case pairs with two controls. What study design has been chosen? 
 Options:  <1> Prospective cohort study. <2> Cases and controls study. <3> Case-control study nested. <4> Retrospective cohort study. <5> Ecological study
answer:
3


question:
Question: Which of the following factors influences the glomerular filtration rate (GFR) ?: 
 Options:  <1> Blood pressure <2> The renal blood flow. <3> Self-regulation by myogenic responses and tubuloglomerular feedback. <4> Hormones such as Angiotensin II and neurons of the sympathetic nervous system. <5> All are correct.
answer:

5