Hey , It's a good question to ask
Choosing Been Scientist as a profession, something that depends on individual's thought processing.
Like Which stream makes you feel to question out it's concepts, because till the time you don't question any old concept, you can't find anything new in it. So this way it totally depends on individual's field of interest.
Thank you
And all the best

Dear fellow student ;
This answer truly depends on the interest of person.

1)For example. If you like to get your hand dirty with programming, oil, circuit , research or any technical problem.
If you wanted to research upon the field of Physics
Choose PCM

2)And if you like nature. Environment around you. And wanna contribute to it.
Biology is somewhat related to chemistry. If you really wanted to do something in the field of chemistry then

Choose PCB

By becoming doctor, or opting biotechnology or doing research in biology you can get that statisfaction you are seeking for.


Best of luck