Which one interests you. Yes, thats my answer. A person can do good only in the area which interest him / her. Be it shoe making or making aeroplanes.

My personal point is that chose for agriculture, as india agriculture based country and offers huge potential in it. But dont go by my philosophy before drawing water from well you need bucket and rope, check how long the rope is.

Check which are the areas that interests you and the potential they offer and what you wanna be an agriculturist or a pharmacist. Then decide.

Good Luck