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
Shanti, aged 27 yrs presented with complaints of difficulty in reading near print. There is ptosis and diplopic in all directions. She is having? 
Select and explain. 
A. III CN palsy, B. Myasthenia gravis, C. Presbyopia, D. VI CN palsyBasal cell carcinoma
B: Myasthenia gravis
Answer: B: Myasthenia gravis 
Explanation: B i.e. Myasthenia gravis