Structures passing through foramen spinosum is:: (A) Accessory meningeal artery, (B) Middle meningeal artery, (C) Mandibular nerve, (D) Maxillary nerve
Answer is B. The foramen spinosum is situated posterolateral to foramen ovale in the lateral part of middle cranial fossa.
Structures passing through the foramen spinosum:

Middle meningeal artery.
Meningeal branch of mandibular nerve or Nervus spinosus.
Middle meningeal vein - posterior trunk.