D.
B.C.G (Note: This is likely a typo in the option, as B.O.G is not a common vaccine name, and the intended vaccine is often BCG for Tuberculosis, which is also commonly given at birth in many regions.)
Correct Answer: Option A
Explanation
The first immunization given to a baby is typically the Polio vaccine, which is administered at birth or within the first few weeks of life. This is usually followed by a series of other vaccinations.
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