Would you tell me which one of the following alternatives are grammatically well-formed?
1. I am master's in chemistry.
2. I am a master's in chemistry.
3. I am master in chemistry.
4. I am master of chemistry.
5. I am a master of chemistry.
And one more q : how would you convey this meaning naturally?
What is the most common and natural way to say that you hold the MA degree?