<prompt> Quellung reaction is associated with -Capsular degenerationCapsular delineationCapsular absenceLecithinase production  <response>: 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. 