这类新药对这个病人是否有效还是一个问题。(remain)

It remains a question whether this kind of new medicine works for the patient.

It remains a question whether this new drug will do good to patients.

这类新药对这个病人是否有效还是一个问题。
It's still a doubt whether such new medicine has a good effect on this patient.

It remains a question whether this new medicine works for the patients.

It remains a question whether this new kind of medicine works for the patients.