Step 1: Mission Indradhanush, named after the seven colours of the rainbow, was launched to immunize all unvaccinated and partially vaccinated children against seven vaccine-preventable diseases.
Step 2: The original seven diseases targeted are diphtheria, pertussis (whooping cough), tetanus, childhood tuberculosis, polio, hepatitis B, and measles.
Step 3: Comparing the options against this list, tuberculosis, measles, and diphtheria are all included. Japanese encephalitis is NOT among the original seven core diseases.
Step 4: Therefore option C (Japanese Encephalitis) is the correct answer as the one not covered. (Note: later expansions added a few antigens, but in the original seven-disease mission Japanese encephalitis was not included.)