**Core Concept:** Acute cholecystitis is an inflammation of the gallbladder, often caused by gallstones. Management typically involves medical treatment and monitoring, with surgery considered if symptoms persist or worsen.

**Why the Correct Answer is Right:** In this scenario, the patient is being managed medically due to controlled symptoms. A solitary gallstone measuring 1.5 cm is present, which can be treated with medical management initially, as surgery is typically reserved for patients with severe symptoms or complications from the gallstone disease. The goal is to monitor the patient's response to treatment and intervene further if needed.

**Why Each Wrong Option is Incorrect:**

A. Surgery (Cholecystectomy) - The patient's symptoms are controlled, making surgery an unnecessary immediate step.
B. Further imaging (e.g., MRI or CT scan) - Medical management is appropriate, so there is no need for further imaging at this stage.
C. Surgical consultation only - As explained above, medical management is the preferred approach initially.
D. No intervention - This is not an appropriate management plan for a patient with acute cholecystitis, as medical treatment is necessary.

**Clinical Pearl:** The correct management of acute cholecystitis involves a step-wise approach, starting with medical treatment and closely monitoring the patient's response. Surgery is typically reserved for patients with uncontrolled symptoms or complications.

**Correct Answer:** D. No intervention - Due to controlled symptoms with medical management, there is no need for further immediate steps like surgery, imaging, or surgical consultation. The patient should continue medical treatment and be monitored closely for response and potential complications.