This isn't the place for YouTube videos, one-answer questions with little to no debate in them or threads with no real topic.
Does this thread seriously belong in SD? All of the answers are basically prefixed with "I would...". This is an opinion poll, not a serious discussion of moral and ethics.
I made it a simple as possible but since a lot of people think there is no answer or that both are morally evil, or that between A and B, they can choose C (which is to jump) I'll add more detail.
Assuming that only A or B are permissible and A and B result in the death(s) we would have to quantify which live(s) are worth more...
Except, now you don't even have the precise question that I think you are seeking the answer to which would be: Which decision would be less morally bad then the others? Both decisions result in death so they are both morally bad but relatively which one is less is a better question.
The question is, could you throw the switch, killing one precious person to save five less precious ones?
There are 3 things wrong with your original question: There are unnecessary physical details which brings the dilemma into a realm with more options, the question only asks for the possibility of making a decision, and, if interpreted the implied way, the question asks for a personal choice without elaborating on ethics.
Here I'll restate the problem:
You have to choose either your true love or five non-immediate relatives to die and you are not permitted any other option. By default, the five relatives will die if no choice is made. What is the most moral choice and why?
Concise, unambiguous, and fits into SD.