This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Strabismus, Subject name: Ophthalmology
[{'content': 'Primary angle = secondary angle of deviation in which squint \nSelect and explain. \nA. Concomitant, B. Paralytic, C. Latent, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (Concomitant). (Ref. Parson, Diseases of Eye, 18th/341, Basak, Ophthalmology, 2nd /298)SQUINTS. No.Concomitant (Aparalytic)Paralytic (Nonconcomitant)1.Sudden onsetInsidious onset2.Developmental originAcquired3.Infants and childrenAdults affected4.DiplopiaNo diplopia5.Normal head postureAbnormal head posture6.No false projectionFalse projection +7.Angle of squint constant in all direction of gazeVariable angle of squint8.Normal ocular movementOccular movements restricted9.Secondary angle of deviation = primary angleSecondary angle > primary10.AmblyopiaNo amblyopia11.Good surgical resultsNot satisfactory/contraindicated', 'role': 'assistant'}]