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
A distinctive clinical manifestation of a successful Rapid Maxillary Expansion is: 
Select and explain. 
A. Anterior crossbite, B. Posterior crossbite, C. Midline diastema, D. Open bite
C: Midline diastema
Answer: C: Midline diastema 
Explanation: Rapid maxillary expansion (RME) results in rapid correction of the cross-bite occurring in 2–6 weeks. A midline diastema may appear which is suggestive of the mid-palatal split. This diastema would close spontaneously due to the recoil of the stretched trans-septal group of gingival fibres.
Reference: Orthodontics: Diagnosis and Management of Malocclusion and Dentofacial Deformities 3rd O P Kharbanda, pdf no 2403