This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
Lateral medullary syndrome, features are 
Select and explain. 
A. Ipsilateral numbness of face and trunk, B. Horner's syndrome, C. Contralateral paralysis, D. All
B: Horner's syndrome
Answer: B: Horner's syndrome 
Explanation: Symptoms and sign of lateral medullary syndrome are : *Horner's syndrome due to descending sympathetic pathway involvement *Ipsilateral loss of pain and temperature sensation over face due to spinal nucleus and tract of trigeminal nerve involvement *Ipsilateral paralysis of muscles of palate ,pharynx,and larynx due to involvement of nucleus ambiguous. *Contralateral loss of pain and temperature sensation over trunk and limbs due to spinothalamic tract. Ref Harrison20th edition pg 2456