<human>: Does the sentence "Attempts to persuade South Africa to agree to the plan's implementation were not successful until 1988 when the transition to independence finally started under a diplomatic agreement between South Africa, Angola and Cuba, with the USSR and the USA as observers, under which South Africa agreed to withdraw and demobilise its forces in Namibia." provide a valid answer to the question "What was Namibia previously called?"
OPTIONS:
- yes
- no
<bot>: no