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
Provided that the growth pattern of a child is normal, which of the following deciduous molar relation is most likely to remain in an end on molar relation?​ 
Select and explain. 
A. Mesial step, B. Flush terminal plane, C. Distal step, D. None of the above
C: Distal step
Answer: C: Distal step 
Explanation: Only a modest change in molar relationship can be produced by this combination of differential growth of the jaws and differential forward movement of the lower molar. It must be kept in mind that the changes described here are those that happen to a child experiencing a normal growth pattern. 
The transition in molar relationship from the mixed to the early permanent dentition are summarized. Note that the transition is usually accompanied by a one-half cusp (3 to 4 mm) relative forward movement of the lower molar, accomplished by a combination of differential growth and tooth movement. A child's initial distal step relationship may change during the transition to an end-to-end (one-half cusp Class II) relationship in the permanent dentition but is not likely to be corrected all the way to Class I.