**Core Concept:** Acute cholecystitis is an inflammation of the gallbladder, typically caused by a gallstone blocking the cystic duct or artery. Medical management involves pain control, hydration, and antibiotics when indicated. USG (ultrasound) is a non-invasive imaging modality to diagnose gallstones and assess inflammation.

**Why the Correct Answer is Right:** The correct answer is **D**. The patient's symptoms are controlled with medical management, suggesting that the acute episode may resolve without surgical intervention. In this case, conservative management is the most appropriate step.

**Why Each Wrong Option is Incorrect:**

**A.** This option suggests performing surgery immediately, which is not necessary when the patient is symptomatically controlled.

**B.** This option recommends cholecystectomy (gallbladder removal), which might not be necessary when the patient responds to medical management.

**C.** This option recommends cholecystectomy due to the presence of a gallstone, but the patient's symptoms are controlled medically, suggesting that surgery may not be necessary.

**Clinical Pearl:** In acute cholecystitis, the initial goal is to control symptoms with medical management. Gallstones are commonly found in patients with this condition, but surgical intervention is typically reserved for cases with severe symptoms or complications (e.g., cholangitis, perforation, or obstruction).

**Correct Answer:** **D.** Conservative management with close monitoring and continuation of medical treatment until symptoms are resolved. This approach ensures that the patient does not undergo unnecessary surgery.