Which of the following are not disease resistant varieties?
a. Pusa Gaurav
b. Pusa Sem-2
c. Pusa sawani

The given varieties are not disease resistant varieties. These all are insect pest resistant varieties. Pusa Gaurav is the variety of Brassica which resistant to aphids, Pusa Sem-2 is the variety of flat bean and resistant to jassids, aphids and fruit borer, while Pusa Sawani is the variety of okra which is resistant to shoot and fruit borers.