## **Core Concept**
The patient's presentation of haemoptysis, productive cough, clubbing of fingers, and coarse crepitations over the lung base, along with the imaging findings, points towards a chronic lung condition. The key here is to correlate the clinical presentation with the radiological findings to arrive at a diagnosis.

## **Why the Correct Answer is Right**
The correct answer, , suggests a diagnosis of **bronchiectasis**. Bronchiectasis is a condition characterized by the irreversible dilatation of parts of the airways due to chronic inflammation and infection. The patient's symptoms of productive cough and haemoptysis are classic for bronchiectasis. The clubbing of fingers and coarse crepitations over the lung base are also consistent with this diagnosis. The CT scan likely shows dilated bronchi, which is diagnostic of bronchiectasis.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option might suggest a different lung condition, but without specifying, it's hard to directly refute. However, conditions like **pneumonia** or **atelectasis** wouldn't typically present with such chronic symptoms or clubbing.
- **Option B:** This could imply **chronic obstructive pulmonary disease (COPD)** or another condition, but COPD usually has a smoking history and doesn't typically present with haemoptysis as a primary symptom.
- **Option D:** This might suggest **pulmonary fibrosis** or another interstitial lung disease, which could present with crepitations but usually doesn't have productive cough or haemoptysis as primary symptoms.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **bronchiectasis** can be diagnosed and assessed with a **high-resolution CT (HRCT) scan**, which is more sensitive than a chest X-ray. The presence of **clubbing** and **recurrent respiratory infections** should prompt consideration of bronchiectasis.

## **Correct Answer:** .