dr. hermit believes that antibiotic creams reduce the spread of disease, dr. samsa has a completely opposite opinion and feels that antibiotic creams are detrimental to people's immune systems in the long run.

which would word or phrase most logically go into the blank in this sentence?

a) so
b) and
c) while
d) because

 C) while.

Explanation:

Hi, the word while  is used to contrast. It’s used between two complete sentences.  

For example  

Dr. Hermit believes that antibiotic creams help reduce the spread of disease, while Dr. Samsa has a completely opposite opinion and feels that antibiotic creams are detrimental to people's immune systems in the long run.  

In this case, while is used to contrast both doctors' different opinions.  

So, the correct option is C) while.

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