Context: Yogi Adityanath of the Bharatiya Janata Party has served as the incumbent chief minister since 19 March 2017.

Question: who is the cheif minister of uttar pradesh up?
Steam of consciousness below:
The relevant sentence in the passage is: Yogi Adityanath of the Bharatiya Janata Party has served as the incumbent chief minister since 19 March 2017.
So, the answer is Yogi Adityanath of the Bharatiya Janata Party.