The correct answer is A. Hisar.
The Central Buffalo Research Institute (CBRI) is a premier research institute in the field of buffalo production and management. It is located in Hisar, Haryana, India. The institute was established in 1962 with the objective of conducting research on buffalo production and management. The institute has made significant contributions in the field of buffalo production and management. It has developed several high-yielding buffalo breeds, such as Murrah, Surti, and Nili Ravi. The institute has also developed several technologies for buffalo production and management, such as artificial insemination, embryo transfer, and crossbreeding. The institute has played a key role in the development of the buffalo industry in India.
The other options are incorrect.
Option B, Chandigarh, is the capital of the Indian state of Punjab. It is not located in Haryana.
Option C, Mahendragarh, is a district in the Indian state of Haryana. It is not located in the city of Hisar.
Option D, Sirsa, is a district in the Indian state of Haryana. It is not located in the city of Hisar.