In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.

Input: Consider Input: when did robben island became a world heritage site

Output: 1999


Input: Consider Input: when was taylor swift's first album released

Output: October 24, 2006


Input: Consider Input: which hormone plays a significant role in appetite stimulation


Output: Ghrelin