**Core Concept**
Bell's palsy is a form of acute peripheral facial nerve palsy, characterized by sudden onset of unilateral lower motor neuron weakness or paralysis of the facial muscles. It is the most common cause of acute facial paralysis and typically presents with a sudden onset of weakness or paralysis of the facial muscles on one side of the face.

**Why the Correct Answer is Right**
Bell's palsy is thought to result from idiopathic inflammation of the facial nerve within the facial canal, leading to demyelination and axonal damage. The inflammation is often caused by reactivation of the varicella-zoster virus, which resides in the nerve ganglia and can reactivate in times of stress or immune suppression. The resulting nerve damage leads to weakness or paralysis of the facial muscles, including the orbicularis oculi, orbicularis oris, and other muscles of facial expression.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as Bell's palsy can indeed present with ipsilateral facial weakness or paralysis.
**Option B:** This option is incorrect as Bell's palsy is often associated with a reduction in corneal sensation due to involvement of the greater superficial petrosal nerve, a branch of the facial nerve.
**Option C:** This option is incorrect as Bell's palsy can present with a range of symptoms, including changes in taste due to involvement of the chorda tympani nerve, a branch of the facial nerve.

**Clinical Pearl / High-Yield Fact**
Bell's palsy is often associated with a reduction in corneal sensation, which can increase the risk of corneal ulcers and other complications. Patients with Bell's palsy should be advised to take regular breaks to rest their eyes and use eye drops as needed to maintain eye health.

**Correct Answer:** A.