Question at position 4 Which of these is TRUE about ALS (Amyotrophic Lateral Sclerosis)?It is caused by the poliovirusIt is due to loss of dorsal motor neuronsIt is due to loss of dorsal sensory neuronsIt is due to loss of ventral sensory neuronsIt is due to loss of ventral motor neurons单项选择题

A

It is caused by the poliovirus

B

It is due to loss of dorsal motor neurons

C

It is due to loss of dorsal sensory neurons

D

It is due to loss of ventral sensory neurons

E

It is due to loss of ventral motor neurons

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Over three months, a 50 year old man has noticed progressive wasting of first the right upper limb, and then the left, involving the intrinsic muscles of the hand and the muscles of the forearm. He has not had pain, paraesthesiae or sensory loss. He has noticed twitching of the involved muscles. He is quite weak in the clinically wasted muscles, but also mildly so in biceps and triceps brachii. Tone is normal. The biceps, triceps and supinator reflexes are brisk in both arms. Which of the following is the likely diagnosis?

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