**Core Concept**
The pterygo palatine fossa is an anatomical space located in the sphenoid bone, which is a key structure in the skull base. The posterior wall of this fossa contains several canals that are critical for the innervation and drainage of the surrounding structures. Understanding the anatomy of these canals is essential for diagnosing and managing various neurological and otolaryngological conditions.

**Why the Correct Answer is Right**
The correct answer is related to the anatomy of the posterior wall of the pterygo palatine fossa, which contains several foramina that allow for the passage of nerves and blood vessels. The foramen ovale, foramen spinosum, and the vidian canal are the primary canals that open on the posterior wall of this fossa. The foramen ovale transmits the mandibular nerve (V3), which is a branch of the trigeminal nerve. The foramen spinosum transmits the middle meningeal artery and its accompanying vein. The vidian canal transmits the vidian nerve, which is a branch of the maxillary nerve (V2).

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the foramen ovale is indeed a canal that opens on the posterior wall of the pterygo palatine fossa, transmitting the mandibular nerve.
* **Option B:** This option is incorrect because the foramen spinosum is another canal that opens on the posterior wall of the pterygo palatine fossa, transmitting the middle meningeal artery and its accompanying vein.
* **Option D:** This option is incorrect because the vidian canal is also a canal that opens on the posterior wall of the pterygo palatine fossa, transmitting the vidian nerve.

**Clinical Pearl / High-Yield Fact**
Remember that the foramen ovale is a critical landmark for diagnosing and managing conditions related to the mandibular nerve, such as trigeminal neuralgia or mandibular nerve palsy.

**Correct Answer:** A.