A renal tumour which has a multicentric origin -: (A) Wilm's tumour, (B) Transitional cell carcinoma, (C) Squamous cell carcinoma, (D) Renal cell
Answer is A. Wilms tumor 

Wilms tumor is the most common primary renal tumor of childhood.
The usual age for diagnosis is 2-5 years.
Approximately 5% to 10% of Wilms tumors involve both kidney, either simultaneously or one after the other.
Nephrogenic rests are the precursor lesions of Wilms Tumor.
Most children with Wilms tumors present with a large abdominal mass.
Less common presentations are hematuria, abdominal pain, intestinal obstruction, and hypertension.
"10% of Wilms tumors are either bilateral or multicentric at the time of diagnosis". - Robbin's