**Core Concept**
The management of acute cholecystitis involves a balance between immediate relief of symptoms and prevention of complications, such as gangrene or perforation of the gallbladder. The presence of a solitary gallstone, as in this case, indicates a high likelihood of recurrent episodes of cholecystitis if the gallbladder is not removed.

**Why the Correct Answer is Right**
Immediate laparoscopic cholecystectomy is recommended for patients with acute cholecystitis, especially if they are stable and have a solitary gallstone. This approach allows for the removal of the gallbladder before complications can occur, reducing the risk of recurrent episodes and the need for emergency surgery. Laparoscopic cholecystectomy is also associated with shorter hospital stays, less post-operative pain, and quicker recovery times compared to open cholecystectomy.

**Why Each Wrong Option is Incorrect**
**Option A:** Regular follow-up is not sufficient for a patient with acute cholecystitis, as it does not address the underlying cause of the disease and increases the risk of recurrent episodes.
**Option B:** IV antibiotics may be used to manage symptoms in the short term, but they do not address the underlying cause of the disease and may not prevent recurrent episodes.
**Option D:** Open cholecystectomy, while effective, is associated with longer hospital stays, more post-operative pain, and slower recovery times compared to laparoscopic cholecystectomy.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the American College of Surgeons and the American Gastroenterological Association recommend a laparoscopic approach for the treatment of acute cholecystitis, especially in patients with a solitary gallstone, to minimize the risk of recurrent episodes and complications.

✓ Correct Answer: C. Laparoscopy cholecystectomy immediately