Which molecule is represented by the structure $H_2L_2$?

  • A
    Antigen
  • B
    Antibody
  • C
    Interferon
  • D
    Antibiotic

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The 'first line of defence' is known as:

Assertion $A$: Vaccination protects an individual against infection by specific pathogens.
Reason $R$: $B$ and $T$ memory cells produce antibodies in large quantities to neutralize the pathogen attack.
Which option is correct for Assertion $A$ and Reason $R$?

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