Correct Answer: C

Rationale: The classic definition of public health originates from Dr. C. E. Winslow. He defined public health as 'the science and art of preventing disease, prolonging life, and promoting health through organized efforts and informed choices of society, organizations, public and private, communities, and individuals.' Winslow's definition is widely recognized and used as a foundational concept in the field of public health.

Correct Answer: B

Rationale: The primary goal of public health is to prevent disease and disability by implementing measures to protect and improve the health of communities and populations. While achieving health equity, prolonging life, and promoting health are important aspects of public health, the central focus remains on preventing diseases and disabilities through various strategies such as vaccination programs, health education, and environmental regulations.

Correct Answer: C

Rationale: Intermediate level of care facilities are equipped to perform minor surgeries and conduct basic laboratory tests. These facilities bridge the gap between primary health care centers and hospitals offering specialized tertiary care services.

Correct Answer: D

Rationale: The four cornerstones of primary health care are active community participation, support mechanisms made available, and the use of appropriate technology. Inter-sectoral linkages, while important, are not part of the four core pillars in primary health care.

Correct Answer: C

Rationale: A health deficit refers to a gap between one's current health status and the health status that could be realistically achieved. It signifies the difference between where a person's health is currently and where it could potentially be with appropriate interventions or improvements. Therefore, the correct answer is option C.