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As far as I can recall there are just a few words in the English language which end with the spelling -tion after an 'S' which have a pronunciation ending as 'chan'. But in South Asia, 99% of the people pronounce such words as 'shan'.
I am referring to words like digestion, suggestion, combustion, congestion, indigestion, exhaustion, etc.
But people pronounce the word question correctly as 'chan'.
The correct pronunciation of all the words mentioned above ends with 'chan'.
Since 'English' is not the native language of South Asians, their pronunciation may have some flaws. However, many South Asians are picking up correct pronunciation with more global exposure.
