## **Core Concept**
Gradenigo's syndrome, also known as Gradenigo-Lannois syndrome, is a rare but serious infection of the petrous apex of the temporal bone. It involves the **trigeminal nerve (cranial nerve V)**, **abducens nerve (cranial nerve VI)**, and **oculomotor nerve (cranial nerve III)** or **trochlear nerve (cranial nerve IV)**, but primarily focuses on the involvement of **cranial nerves V and VI** due to its anatomical location.

## **Why the Correct Answer is Right**
The correct answer involves **cranial nerves V and VI**. Gradenigo's syndrome classically presents with a triad of symptoms:
- **Severe pain** in the distribution of the **trigeminal nerve (cranial nerve V)**,
- **Diplopia** (double vision) due to **abducens nerve (cranial nerve VI)** palsy,
- and **Otitis media** as a preceding condition.
The syndrome results from the spread of infection from the middle ear to the petrous apex, affecting these nerves.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option does not specify nerves and cannot be evaluated.
- **Option B:** This option is incorrect because it does not accurately represent the nerves involved in Gradenigo's syndrome.
- **Option C:** This option might include nerves not specifically associated with Gradenigo's syndrome or might not accurately represent the primary nerves involved.
- **Option D:** This option is incorrect because it inaccurately represents the cranial nerves involved in Gradenigo's syndrome.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Gradenigo's syndrome is a serious complication of otitis media and mastoiditis, characterized by the involvement of **cranial nerves V (trigeminal) and VI (abducens)**, presenting with severe facial pain and lateral rectus palsy leading to diplopia.

## **Correct Answer: B. V and VI.**