Based on the relationship between literacy rates and per capita GDP, which South Asian nation has the HIGHEST literacy rate among its citizens?

Per capita GDP:
Afghanistan: $1,976
China: $16,842
india: 7,166
japan: $42,067

Based on the provided information, Japan has the highest per capita GDP at $42,067. However, the question is about the literacy rate, not per capita GDP. Therefore, the given data is insufficient to determine which South Asian nation has the highest literacy rate.