**Core Concept**
Hypercoagulability refers to an increased tendency of blood to form clots, which can lead to conditions such as thrombosis. Acquired causes of hypercoagulability are conditions that develop over time, as opposed to inherited causes that are present from birth. These conditions can be due to various factors, including genetic mutations, environmental factors, and medical conditions.

**Why the Correct Answer is Right**
The correct answer is an acquired cause of hypercoagulability because it is a condition that develops over time, often as a result of an underlying medical condition, such as cancer, or a medication, such as estrogen therapy. This condition leads to the formation of antiphospholipid antibodies, which activate the coagulation cascade and increase the risk of thrombosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is actually a hereditary condition, not an acquired cause of hypercoagulability. **Option B:** This option is incorrect because it is not directly related to hypercoagulability, although it may be a risk factor for thrombosis. **Option C:** This option is incorrect because it is actually a condition that can increase the risk of bleeding, not hypercoagulability.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that acquired causes of hypercoagulability can be due to various factors, including medical conditions, medications, and lifestyle factors. A thorough medical history and physical examination are crucial in identifying these causes.

**Correct Answer:** A. Factor V Leiden mutation is a hereditary condition, not an acquired cause of hypercoagulability.