Final answer:
The correct answer is Cholecystitis (choice a). Cholecystitis is an acute inflammation of the gallbladder, which is most frequently caused by obstruction.
Step-by-step explanation:
The correct answer is Cholecystitis (choice a). Cholecystitis is an acute inflammation of the gallbladder, which is most frequently caused by obstruction. When large gallstones obstruct the bile duct, it can lead to the inflammation of the gallbladder. This condition can cause severe pain and other symptoms such as jaundice.