This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Viral infections, Subject name: Dental
Forschheimer's sign: 
Select and explain. 
A. Seen in rubella, B. Are red macules or petechiae confined to the hard palate., C. Found after 2nd day of the rash, D. Pathognomonic of rubeola
A: Seen in rubella
Answer: A: Seen in rubella 
Explanation: Forschheimer spots are a fleeting enanthem seen as small, red spots (petechiae) on the soft palate in 20% of patients with rubella Seen during the prodromal period or on the first day of the rash. They precede or accompany the skin rash of rubella. They are not diagnostic of rubella, as similar spots can be seen in measles and scarlet fever.