I had previously attempted to give blood - and I had previously failed . But it was time to try again on Friday , and this time I was determined to give my blood , come hell or high water . I was worried that I 'd get nauseous again , as I did last time . I did my best to eat properly on Friday - I did n't even have any coffee that day - and I also had a game plan : If I did get nauseous , I would n't tell them .

Question: what may be the reason for them not being able to give blood ?
Answer: They are anemic .They are so afraid of needles that they get sick .None of the above choices .They have a disease .