The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The radiopacity that frequently obliterate the root apices of maxillary molars is   (A) Maxillary sinus   (B) Palatine bone   (C) Zygoma and Zygomatic process of Maxilla   (D) Orbital process of Zygomatic bone
['(C) Zygoma and Zygomatic process of Maxilla <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Maxillary sinus \n (B) Palatine bone \n (C) Zygoma and Zygomatic process of Maxilla \n (D) Orbital process of Zygomatic bone <> possible answers', '  The radiopacity that frequently obliterate the root apices of maxillary molars is <> context@']