Step 1: Understand IMCI and IMNCI.
IMCI is the global Integrated Management of Childhood Illness strategy. IMNCI is the Indian adaptation, the Integrated Management of Neonatal and Childhood Illness, modified to fit the Indian disease burden.
Step 2: List the Indian adaptations (how IMNCI differs).
IMNCI gives much greater emphasis to the newborn and includes the 0 to 7 day age group, which the original IMCI did not cover well. It places strong emphasis on management of sick young infants and neonates. It also incorporates conditions relevant to India, and several local programme conditions are built in.
Step 3: Find the feature common to both.
The integrated approach itself, treating more than one disease or condition in a sick child at the same time rather than focusing on a single illness, is the core of IMCI and is fully shared by IMNCI. So treating more than one disease at a time is NOT a point of difference; it is common to both.
Therefore the exception is option D.
Answer: Option D.