Which Act made the central legislature bicameral i.e., the Council of States and Legislative Assembly?

Answer: [C] Government of India Act, 1919

The Government of India Act 1919 had a separate Preamble. Key points of the preamble were as follows:
India to remain as an integral part of British Empire
The Central legislature was made bicameral
It introduced Dyarchy at the provincial level
Gradual decentralization of authority with loosening the supreme hold of the central government
Thus, the preamble of this act suggested for a decentralized unitary form of government
The time and manner towards goal of responsible government will be decided by the British Parliament
Partial responsibility in provinces, but no change in character of the central government

This question is a part of GKToday's Integrated IAS General Studies Module