Quellung reaction is associated with -
Ans. is 'b' i.e., Capsular delineation A suspension of pneumococci is mixed on a slide with a drop of the type specific antiserum and methylene blue. On the presence of homologous antiserum capsule becomes apparently swollen, sharply delineated and refractile.
Capsular degeneration
Capsular delineation
Capsular absence
Lecithinase production