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: Ophthalmology
Right trochlear nerve palsy can lead to all except: 
Select and explain. 
A. Diplopia on upward gaze and adduction, B. Right head tilt, C. Exotropia, D. Hyperopia
B: Right head tilt
Answer: B: Right head tilt 
Explanation: Ans: B. Right head tilt(Ref. Yanoff and Duker 4/e p1228)Right trochlear nerve palsy:Accompanied by compensatory contralateral head tilt (left head tilt), not right head tilt.Signs:Classical sign of unilateral fouh nerve palsy is contralateral head tilt (an 'ocular' toicollis).Exhibited by most patients & usually sole presenting sign in children.Non-ophthalmological causes also considered.Presents with veical diplopia.Torsional diplopia - Due to ocular cyclotorsion accompanies veical diplopia in acquired fouh nerve palsy.