Who among the following was the author of Andhra Sabdha Chintamani, a treatise in Sanskrit on Telugu grammar?

Q. Who among the following was the author of Andhra Sabdha Chintamani, a treatise in Sanskrit on Telugu grammar?
Answer: Nannaya
Notes: Nannaya was the court poet of Raja Raja Narendra. He is the author of Andhra Sabdha Chintamani which a treatise in Sanskrit on Telugu grammar.