This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which among the following is the least common symptom of Wilms tumour? 
Select and explain. 
A. Haematuria, B. Mass abdomen, C. Pain, D. Fever
D: Fever
Answer: D: Fever 
Explanation: After neuroblastoma, Wilms tumor is the second most common abdominal tumor in children. Symptoms consist of abdominal enlargement in 60%; pain in 20%; hematuria in 15%; malaise, weakness, anorexia, and weight loss in 10%; and fever in 3%. Hypeension is noted in over half of patients. Ref: Albanese C.T., Sylvester K.G. (2010). Chapter 43. Pediatric Surgery. In G.M. Dohey (Ed), CURRENT Diagnosis & Treatment: Surgery, 13e.