**Core Concept**
Allergic bronchopulmonary aspergillosis (ABPA) is a hypersensitivity reaction to Aspergillus antigens in patients with asthma or cystic fibrosis. It is characterized by an inflammatory response to Aspergillus fumigatus, leading to airway obstruction and lung damage.

**Why the Correct Answer is Right**
The diagnostic features of ABPA include a combination of clinical and radiological findings. These include a history of asthma or cystic fibrosis, elevated serum IgE levels, and the presence of Aspergillus-specific IgE antibodies. Patients with ABPA often exhibit central bronchiectasis, mucoid impaction, and fleeting pulmonary infiltrates on chest radiographs. The pathophysiology of ABPA involves an allergic response to Aspergillus antigens, leading to the release of inflammatory mediators and the activation of immune cells.

**Why Each Wrong Option is Incorrect**
**Option A:** Central bronchiectasis is a characteristic feature of ABPA, making this option incorrect.
**Option B:** Elevated serum IgE levels are a diagnostic criterion for ABPA, so this option is also incorrect.
**Option C:** Aspergillus-specific IgE antibodies are a key diagnostic marker for ABPA, making this option incorrect.
**Option D:** Mucoid impaction and fleeting pulmonary infiltrates are diagnostic features of ABPA, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
ABPA is often misdiagnosed as exacerbations of asthma or cystic fibrosis. A high index of suspicion and the use of diagnostic criteria, such as the Ishikawa criteria, can help diagnose ABPA.

**Correct Answer: D. Mucoid impaction and fleeting pulmonary infiltrates are characteristic features of ABPA, so option D should be excluded.