**Question:** All are components of Meig's syndrome, except:

A. Pleural effusion
B. Thrombocytopenia
C. Pulmonary fibrosis
D. Colorectal cancer

**Core Concept:**
Meig's syndrome is a rare clinical entity characterized by the association of benign ovarian tumors (usually epithelial) with pleural effusion and thrombocytopenia. The syndrome is named after Dr. Margaret Meig, who first described this condition in 1945.

**Why the Correct Answer is Right:**
Meig's syndrome is primarily caused by the production of chylothorax (pleural effusion) and subsequent immunosuppression, which leads to thrombocytopenia. However, colorectal cancer is a separate entity and not a component of Meig's syndrome. Colorectal cancer typically presents with different symptoms and diagnostic criteria, such as peritoneal carcinomatosis, abdominal pain, and elevated cancer antigen (CA) 19-9 levels.

**Why Each Wrong Option is Incorrect:**
A. Pleural effusion (Option A) is a core component of Meig's syndrome, as it results from the production of chylothorax due to ovarian tumors.
B. Thrombocytopenia (Option B) is also a core component of Meig's syndrome, as it is caused by immunosuppression due to pleural effusion.
C. Pulmonary fibrosis (Option C) is not a component of Meig's syndrome. The syndrome primarily involves pleural effusion and thrombocytopenia, not lung involvement.
D. Colorectal cancer (Option D) is a separate entity and not a component of Meig's syndrome.

**Clinical Pearl:**
Understanding the distinct features of Meig's syndrome is crucial for accurate diagnosis and management. Pleural effusion and thrombocytopenia are the primary symptoms, while colorectal cancer is a separate, albeit related, condition.

**Correct Answer:** D. Colorectal cancer (Option D) is not a component of Meig's syndrome. Meig's syndrome involves pleural effusion and thrombocytopenia, whereas colorectal cancer typically presents with abdominal symptoms, elevated CA 19-9 levels, and peritoneal carcinomatosis.