The correct answer is: C. Sixth
The Livestock Health and Disease Control Scheme was launched in the Sixth Five Year Plan (1980-1985). The scheme was aimed at improving the health and productivity of livestock in India. It provided for the establishment of veterinary hospitals and dispensaries, training of veterinary personnel, and distribution of vaccines and other veterinary drugs. The scheme was a major success, and it helped to reduce the incidence of livestock diseases in India.
The other options are incorrect. The First Five Year Plan (1951-1956) did not have a Livestock Health and Disease Control Scheme. The Third Five Year Plan (1961-1966) had a scheme called the “Livestock Development Programme”, but this was not specifically focused on disease control. The Tenth Five Year Plan (2002-2007) had a scheme called the “National Livestock Mission”, but this was a much broader scheme that covered a range of issues related to livestock development, including disease control.