which a level should i do??????

im so stuck on what to choose for my 3rd a level, i really dont want to do 4 because i just dont think ill be able to handle the workload and i want to pursue a career in medicine or dentistry so my first two options are biology and chemistry but for the third i dont know whether to english lit or economics, i seriously love both and im slightly better at business at gcse but im predicted the same grade i both at the end of y11. im so sick of everyone telling me to choose the one im most passionately about because i really do love them equally and my teachers for both are great, i could take both and drop one a few weeks into y12 but i dont know if ill meet the grade requirements at my school to do 4 so i really do need to make this decision now and i can change it in y12 if i find that ive made the wrong choice but for now i really need some input. ive probably worded this horribly but please someone help!!!!!