I want to know the answer to the following question:
What economic sanction against Iranian crude oil has adversely affected the Iranian economy?
All the background I'm provided with is that "Following a successful implementation of the 2015 nuclear and sanctions relief deal, the resulting benefits might not be distributed evenly across the Iranian economy as political elites such as the Islamic Revolutionary Guard Corps have garnered more resources and economic interests.". Is that enough to answer the question?
Answer: no