Which act introduced Dyarchy in the provinces?

Explanation
Diarchy particularly  referred  to the system of  shared  rule in  British India   established  by the  Government of India Acts 1919  Dyarchy  means  the  double system  of  government  in which  two heads  are  responsible  for administration. Dyarchy was  introduced  as a  constitutional reform  by  Edwin Samuel Montagu  and  Lord Chelmsford  The  Government of India Act  of  1935  ended the system of  Diarchy  and  established  ' provincial autonomy '. ND17-1-2023 ۔