Task: Question Answering
Input (English): 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.
Output (English): 5