A pt presented with open tibial fracture. Which antibiotic you will give.. Cefazolin, gentamycin & metronidazole

A pt presented with open tibial fracture. Which antibiotic you will give?
a. Cefazolin
b. Gentamycin
c. Cefazolin & gentamicin
d. Cefazolin, gentamycin & metronidazole.