Step 1: Understand the question.
We must find how many kinds of pronoun (Sarvanam) exist when classified by usage and meaning.
Step 2: Recall what a pronoun does.
A pronoun replaces a noun, and its classification depends on the functional role it plays in a sentence.
Step 3: List the functional types.
Hindi grammar names Purushvachak (personal), Nishchayvachak (demonstrative), and Anishchayvachak (indefinite) as the first three types.
Step 4: Continue the list.
Next come Sambandhvachak (relative), Prashnavachak (interrogative), and Nijvachak (reflexive), giving three more types.
Step 5: Count the total.
Adding both groups, $3 + 3 = 6$ functional categories of pronoun.
Step 6: Match with the options.
Six categories correspond to chhah, which is option A.
\[ \boxed{\text{A. } \text{chhah (six)}} \]