This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pediatrics
True about Mongolian spots is: 
Select and explain. 
A. Disappear by 1 year of age, B. Reappear by 1 year of age, C. Persist throughout life, D. Have variable presentation in non-Mongolians
A: Disappear by 1 year of age
Answer: A: Disappear by 1 year of age 
Explanation: Ans. A. Disappear by 1 year of ageMongolian spot refers to a macular blue-gray pigmentation usually on the sacral area of healthy infants. Mongolian spot is usually present at birth or appears within the first weeks of life.