With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The largest urban area of Australia is the most populous city in Australia and Oceania.
text_B: Robert Fiske may refer to  :. Robert Fiske -LRB- actor -RRB- -LRB- 1889 -- 1944 -RRB- , American film actor. Robert B. Fiske -LRB- born 1930 -RRB- , American lawyer and Whitewater special prosecutor. Robert B. Fiske. Robert B. Fiske. Robert Fiske Bradford -LRB- 1902 -- 1983 -RRB- , American politician. Robert Fiske Bradford. Robert Fiske Bradford. Robert Fiske Griggs -LRB- 1881 -- 1962 -RRB- , American botanist and ecologist. Robert Fiske Griggs. Robert Fiske Griggs
not_related.