Final answer:
Pope Clement VII died after eating a poisonous mushroom, specifically death cap mushrooms, on September 25, 1534. His death remains controversial, with some uncertainty about whether it was accidental or intentional due to his contentious papacy.D. Clement VII.
Step-by-step explanation:
The Pope who died after eating a poisonous mushroom is Clement VII. Historical accounts suggest that Clement VII (Giulio de' Medici) died on September 25, 1534, after eating death cap mushrooms, which are highly toxic. It is unclear whether his poisoning was accidental or intentional, as he was a controversial figure during his papacy, which spanned from 1523 to 1534. The circumstances surrounding his death are still subject to some debate among historians.