A patient of rheumatoid arthritis presents with progressive quadri-paresis and weakness, Babinsky sign was positive, increased muscle tone of limbs with exaggerated tendon jerks and worsening of gait with no sensory, sphincter involvement. Best initial investigation is-: (A) X-ray of cervical area of neck in flexion and extension, (B) MRI brain, (C) EMG and NCV within 48 hours, (D) Carotid angiography
Answer is A. None