Complete the following analogy.

(I) Tetradynamous : 6 stamens 
     Didynamous : $\mathrm{\_\_A\_\_}$
(II) Stamens free: Polyandrous,
     Stamens united in many bundles :$\mathrm{\_\_B\_\_}$ 

In tetradynamous condition total stamens are six out of which two are short and inserted in the outer whorl whereas the rest four are longer and are inserted in the inner whorl. It is found in the plants of Family Brassicaceae such as in mustard (Brassica campestris) and radish (Raphanus sativus).

Didynamous condition is having four stamens disposed in pairs of unequal length found in salvia and Ocimum.

Polyandrous: When the stamens of a flower are free, the condition is called polyandrous. Example: Petunia.

The stamens may be united into one bunch or one bundle - monoadelphous as in China rose.