Lymphocytes are the key cells involved in the immune response.
Antibodies are synthesised by lymphocytes.
Antibodies are involved in the immune response.
What response are antibodies involved in?

[a] resistance activities
[b] the pituitary response
[c] major threat to health
[d] antigens summoning them
[e] Leptospirosis
[f] being taken as a supplement
[g] resistance
[h] the immune response