With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Hilda Ellis Davidson was a teacher.
text_B: The Security Bureau is a body of the Government of Hong Kong responsible for a range of activities , including law enforcement , search and rescue and administer various laws in relation to the security of Hong Kong .. Government of Hong Kong. Government of Hong Kong. The bureau is headed by the Secretary for Security .. Secretary for Security. Secretary for Security. Before 1997 , it was named the Security Branch .. Before 1973 it was known as the Defence Branch .
not_related.