Context: The language has numerous regional dialects which are generally not mutually intelligible. It is employed throughout the Tibetan plateau and Bhutan and is also spoken in parts of Nepal and northern India, such as Sikkim. In general, the dialects of central Tibet (including Lhasa), Kham, Amdo and some smaller nearby areas are considered Tibetan dialects. Other forms, particularly Dzongkha, Sikkimese, Sherpa, and Ladakhi, are considered by their speakers, largely for political reasons, to be separate languages. However, if the latter group of Tibetan-type languages are included in the calculation, then 'greater Tibetan' is spoken by approximately 6 million people across the Tibetan Plateau. Tibetan is also spoken by approximately 150,000 exile speakers who have fled from modern-day Tibet to India and other countries.

Question: How many people across the Tibetan Plateau speak 'greater Tibetan'?
Answer: approximately 6 million

Question: How many people who have fled modern-day Tibet are considered to be exile speakers of Tibetan?
Answer: approximately 150,000

Question: Why are Dzongkha, Sikkimese, Sherpa, and Ladakhi considered to be separate languages?
Answer: political reasons

Question: Where have 6 million exiles fled to?
Answer: Unanswerable

Question: What is spoken by 156,000 people?
Answer: Unanswerable

Question: What type of dialects are Dzongkha and Sherpa considered?
Answer: Unanswerable

Question: What reason do the speakers of Kham consider their language to be separate? 
Answer: Unanswerable