**Core Concept**
Exfoliative cytology is a diagnostic technique that involves the examination of cells that have been shed or scraped from a particular site in the body. It is particularly useful for identifying abnormal cells, such as those found in cancerous lesions.

**Why the Correct Answer is Right**
Exfoliative cytology can be applied to various sites in the body, including the stomach, bronchus, and cervix. In carcinoma of the stomach, exfoliative cytology can help identify gastric cancer cells that have been shed into the gastric lumen. Similarly, in carcinoma of the bronchus, it can aid in the detection of abnormal cells in sputum samples. In carcinoma of the cervix, exfoliative cytology is a crucial diagnostic tool for identifying cancer cells in cervical smears. The Pap smear is a classic example of exfoliative cytology in action.

**Why Each Wrong Option is Incorrect**
**Option A:** Carcinoma stomach is a type of cancer that primarily affects the stomach lining, and while exfoliative cytology can be used to diagnose it, it is not the only option listed that can be diagnosed using this technique.
**Option B:** Carcinoma bronchus, or lung cancer, is another type of cancer that can be diagnosed using exfoliative cytology, but like carcinoma stomach, it is not the only option.
**Option C:** Carcinoma cervix is a type of cancer that affects the cervix, and exfoliative cytology is a crucial diagnostic tool for this condition, but again, it is not the only option listed.

**Clinical Pearl / High-Yield Fact**
A key aspect of exfoliative cytology is the ability to identify abnormal cells in sputum, urine, or cervical smears. This technique is particularly useful in the early detection of cancerous lesions, and it can be used in conjunction with other diagnostic tools to aid in diagnosis.

**✓ Correct Answer: D. All of the above**