If a state law allows the use of medical marijuana but federal law prohibits it, the state law violates which clause of the constitution?

If a state law allows the use of medical marijuana but federal law prohibits it, the state law violates: The supremacy clause of the Constitution
The supremacy clause indicates that in an event where a Federal law and a state law contradict one another, the federal law must be held at a higher standard than the state law

You gotta post the test so we can answer it

It is meant that like tapestry scientific theories often need to pull out since they are not relevant and often times the whole chain of theories may be pulled out.