The concept of Concurrent List in Indian Constitution was borrowed from

The correct answer is (a) Canada.

The Concurrent List is a list of subjects that are both under the jurisdiction of the central government and the state governments in India. It was borrowed from the Canadian Constitution, which also has a Concurrent List. The Concurrent List was included in the Indian Constitution to ensure that there is uniformity in laws across the country.

The other options are incorrect because:

• Australia does not have a Concurrent List.
• The U.S. Constitution does not have a Concurrent List.
• Great Britain does not have a federal system of government, so there is no need for a Concurrent List.