The four main components of IMNCI (Integrated Management of Neonatal and Childhood Illness) strategy are:
1. Improving care management skills of health care staff
2. Improving health of disabled children
3. Improving family and community health practices
4. Coordination with other departments
5. Improving overall health system

Correct option is A

The four main components of IMNCI are improving case management skills of health care providers, improving family and community health practices, improving the overall health system, and coordination with other sectors. Improving health of disabled children specifically is not a separate main component of IMNCI strategy. Explanation for each option: (a) 1, 3, 4, 5: Correct. These are the officially identified components under the IMNCI strategy. (b) 1, 2, 3, 4: Incorrect. Improving the health of disabled children is important but not listed as a main IMNCI component. (c) 2, 3, 4, 5: Incorrect. Option 2 is incorrect as per official IMNCI framework. (d) 1, 2, 4, 5: Incorrect. Again, option 2 incorrectly includes disabled children’s health separately. (Source: UNICEF IMNCI Manual)