**Core Concept**
Decreased motility of the fallopian tube is associated with conditions that affect ciliary function, particularly those involving primary ciliary dyskinesia. This condition is characterized by abnormal ciliary beating, leading to impaired motility of ciliated epithelial cells, including those in the fallopian tubes.

**Why the Correct Answer is Right**
Kartagener's syndrome is a rare genetic disorder that presents with primary ciliary dyskinesia, characterized by impaired ciliary function. This results in decreased motility of ciliated epithelial cells, including those in the fallopian tubes. The syndrome is caused by mutations in genes encoding dynein arms, which are essential for ciliary beating. The impaired ciliary function in Kartagener's syndrome can lead to infertility, due to decreased motility of the fallopian tubes and poor fertilization.

**Why Each Wrong Option is Incorrect**
**Option A:** Churg-Strauss syndrome is a type of vasculitis that affects small blood vessels, but it is not directly associated with decreased motility of the fallopian tubes.

**Option C:** Noonan syndrome is a genetic disorder that affects various bodily systems, including the cardiovascular and skeletal systems. However, it is not specifically associated with decreased motility of the fallopian tubes.

**Option D:** Turner syndrome is a genetic disorder that affects females, characterized by short stature and ovarian dysgenesis. While it can affect reproductive function, it is not directly associated with decreased motility of the fallopian tubes.

**Clinical Pearl / High-Yield Fact**
Primary ciliary dyskinesia, as seen in Kartagener's syndrome, can also affect the respiratory system, leading to chronic sinusitis and bronchiectasis. This highlights the importance of considering the broader systemic implications of conditions affecting ciliary function.

**✓ Correct Answer: B. Kartagener s syndrome**