I want to know the answer to the following question:
What did Eisenhower have removed via surgery on December 12, 1966?
All the background I'm provided with is that "In August 1966 he began to show symptoms of cholecystitis, for which he underwent surgery on December 12, 1966, when his gallbladder was removed, containing 16 gallstones.". Is that enough to answer the question?
Answer: yes