What is the treatment of choice for this kid

Pulmonary embolism in a patient with low eGRF value (i.e., another way of saying that that patient
has kidney failure, they changed it from low creatinine clearance to this mumbo jumbo). What is the
most important diagnostic modality of this patient?
A. Va Qc with kidney failure (normal eGFR = 125ml/min, here it was about 60ml/min)
B. CTPA
C. MRI

A 10 years old kid with 20 WBCs / HPF (they changed it from WBCs/ml to WBCs/HPF = but still means
the same thing) and 105 Ecoli + bacteruria. What is the treatment of choice for this kid
A. NFT for UTI
B. No option of cephalexin
C. Do nothing