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: Surgery
Which of the following is not a feature of the congenital esotropia 
Select and explain. 
A. Onset before 6 months, B. Cross fixation, C. Inferior oblique overaction, D. Surgery rarely required
D: Surgery rarely required
Answer: D: Surgery rarely required 
Explanation: Surgery rarely required Congenital esotropia is the most common form of the esotropia. By definition esotropia that present before 6 month age, are designated as congenital esotropia. Salient features * More common is children with neurological disorder * Equal gender and racial distribution * Cross-Fixation, Nystagmus (Rotatory and latent), Amblyopia * Inferior oblique overaction, dissociated veical detion (DVD), Asymmetrical monocular pursuit. Treat amblyopia pre-operatively * Surgery is the mainstay of treatment of strabismus, and is done before 2 years of age.