My _ says I still need glasses for my eyes.

Explanation

Option A; chemist is a a person engaged in chemical research or experiments."chemists have developed catalysts that can turn low-grade fuels into petrol"Option B: conductor is a a person who directs the performance of an orchestra or choir. Option C: keeper is a a person who manages or looks after something or someone."I'm your friend, not your keeper"Option D: 'eyes' in the sentnce leads us to the right option 'optician'