For primary immunisation of children aged between 2 months and 10 years, this vaccination is recommended in the form of 3 doses, separated by 1-month intervals and given in a combination vaccine with tetanus, pertussis, hepatitis B, poliomyelitis and haemophilus influenza type b.

• A. Vitamin B12
• B. Diphtheria
• C. Rotavirus
• D. MMR

Answer: (B)

The description points to the diphtheria component of a DTaP-containing vaccine given in infancy as a three-dose primary series spaced about a month apart, formulated in a combination shot with tetanus, pertussis, hepatitis B, polio, and Haemophilus influenzae type b. In practice, this pentavalent or hexavalent vaccine protects against multiple diseases in one injection, started around 2 months of age with three doses at roughly four-week intervals, and then boosters later as needed. Rotavirus is given orally in early infancy but on a different schedule and not in this multi‑component shot; MMR is administered later, and vitamin B12 is not a vaccine. So the described vaccination is the diphtheria-containing component within that combined vaccine.