**Core Concept**
Adenocarcinoma of the lung is a type of non-small cell lung cancer (NSCLC) originating from the glandular cells, which are responsible for producing mucus and other substances in the lungs. It is the most common type of lung cancer in non-smokers and has distinct demographic and pathologic characteristics.

**Why the Correct Answer is Right**
The correct answer is "A. More common in female" because adenocarcinoma of the lung has a higher incidence in women compared to men. This is attributed to the fact that estrogen receptors are present in the glandular cells of the lung, and women have higher levels of estrogen than men. Additionally, women are more likely to be non-smokers, and adenocarcinoma is more prevalent in non-smokers. The presence of estrogen receptors and the higher incidence in non-smokers contribute to the increased risk of adenocarcinoma in women.

**Why Each Wrong Option is Incorrect**
**Option B:** Smoking is a significant risk factor for adenocarcinoma of the lung, as it can lead to genetic mutations and damage to the glandular cells. Therefore, stating that smoking is not associated with adenocarcinoma is incorrect.
**Option C:** Central cavitations are more characteristic of squamous cell carcinoma, a different type of NSCLC. Adenocarcinoma can present with peripheral or central lesions, but central cavitations are not a typical feature.
**Option D:** While upper lobe involvement is common in many types of lung cancer, adenocarcinoma tends to occur in the lower lobes, particularly the left lower lobe.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that adenocarcinoma of the lung often presents with peripheral lesions, and imaging studies may show a subtle, ground-glass opacity (GGO) or a lepidic pattern, which can be challenging to diagnose on chest radiographs.

**✓ Correct Answer: A. More common in female**