**Core Concept**
Right-sided vocal cord palsy is a condition where the right vocal cord does not move properly, leading to impaired voice quality and breathing difficulties. This condition is often caused by nerve damage or paralysis of the recurrent laryngeal nerve, which innervates the right vocal cord.

**Why the Correct Answer is Right**
The recurrent laryngeal nerve, a branch of the vagus nerve, is responsible for supplying motor innervation to the right vocal cord. Damage or paralysis of this nerve can result in right-sided vocal cord palsy. The recurrent laryngeal nerve has a long and tortuous course, which makes it susceptible to injury from various causes, such as thyroid surgery, neck trauma, or malignancies.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the question, as it does not specify a condition associated with right-sided vocal cord palsy.
**Option B:** Left-sided vocal cord palsy would be caused by damage to the left recurrent laryngeal nerve, not the right one.
**Option C:** This option is not a recognized medical condition associated with right-sided vocal cord palsy.

**Clinical Pearl / High-Yield Fact**
The recurrent laryngeal nerve is a common site for injury during thyroid surgery, and vocal cord palsy is a potential complication of this procedure. Surgeons must take great care to avoid damaging this nerve during thyroid surgery to prevent vocal cord palsy.

**Correct Answer: C. Thyroid surgery.