This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
An 8-year old child has end-on-end molar occlusion. The clinician should: 
Select and explain. 
A. Observe and wait for the other permanent teeth to erupt, B. Do the distal disking of 2nd primary molar, C. Extract the 1st primary molars, D. Serial extraction
A: Observe and wait for the other permanent teeth to erupt
Answer: A: Observe and wait for the other permanent teeth to erupt 
Explanation: None