Assertion: The Janata Party won the Lok Sabha Elections of 1977 but its government did not last long.
Reason: Fresh Lok Sabha elections were held in January 1980 in which the Janata Party suffered a comprehensive defeat, especially in north India where it had swept the polls in 1977.

Both the Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Its critics felt that the Janata Party lacked direction, leadership, and a common program. The Janata Party government could not bring about a fundamental change in policies from those pursued by Congress. The Janata Party split and the government which was led by Morarji Desai lost its majority in less than 18 months.