What tropical rain forest ecosystem is found in all of the following South Asian countries except?

The tropical rainforest ecosystem found in South Asia is primarily represented by the Sundarbans, which spans parts of India and Bangladesh. However, countries like Afghanistan and Bhutan do not have significant tropical rainforest ecosystems due to their geographical and climatic conditions. While India, Bangladesh, and parts of Sri Lanka and Myanmar feature lush tropical rainforests, Afghanistan, being more arid and mountainous, lacks this type of ecosystem.