**Core Concept**
The spleen is a common site for metastasis from various primary cancers, but isolated splenic metastasis is relatively rare. This phenomenon is often associated with certain types of malignancies that have a predilection for hematogenous spread.

**Why the Correct Answer is Right**
Carcinoma of the ovary is the most common cause of isolated splenic metastasis due to its tendency to spread through the bloodstream. This is thought to occur through the hematogenous route, where cancer cells from the primary ovarian tumor embolize to the spleen, leading to isolated metastasis. The splenic involvement is often an indicator of advanced disease and poor prognosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Carcinoma pancreas can metastasize to the spleen, but it is not the most common cause of isolated splenic metastasis. Pancreatic cancer tends to spread through the lymphatic system and local invasion rather than hematogenously.
**Option B:** Carcinoma stomach can also metastasize to the spleen, but it is not typically associated with isolated splenic metastasis. Gastric cancer tends to spread to regional lymph nodes and distant organs, such as the liver and lungs.
**Option D:** Carcinoma cervix is a common site for metastasis, but it is not typically associated with isolated splenic metastasis. Cervical cancer tends to spread to regional lymph nodes and distant organs, such as the lungs and liver.

**Clinical Pearl / High-Yield Fact**
The pattern of metastasis to the spleen can provide valuable clues about the primary tumor site and prognosis. In general, isolated splenic metastasis is associated with a poor prognosis and advanced disease.

**✓ Correct Answer: C. Carcinoma ovary**