Correct option is B
Measles (A): The adverse effect associated with the measles vaccine is Autism. Although research has largely debunked any direct link between the MMR vaccine (measles, mumps, rubella) and autism, some early claims led to public concerns, and this is why it is often linked to this adverse effect in common knowledge.
Diphtheria (B): The adverse effect associated with the diphtheria vaccine is Sudden Infant Death Syndrome (SIDS). Some studies have suggested a possible association between vaccines (including Diphtheria) and SIDS, though these links are not conclusively established.
Haemophilus influenzae Type-B (C): The adverse effect associated with this vaccine is Diabetes. There have been some studies and claims suggesting a potential link between certain vaccines and autoimmune diseases, including Type-1 Diabetes, but the evidence is still debated.
Hepatitis-B (D): The adverse effect linked to the Hepatitis-B vaccine is Multiple Sclerosis (MS). Some have speculated a connection between the hepatitis B vaccine and autoimmune diseases like MS, although research does not conclusively support this link.