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: Medicine
A middle aged man presents with progressive atrophy and weakness of hands and forearms. On examination he is found to have slight spasticity of the legs, generalized hyper-reflexia and increased signal in the cortico-spinal tracts on T2 weighted MRI. The most likely diagnosis is - 
Select and explain. 
A. Multiple selerosis, B. Amyotrophic latetal sclerosis, C. Subacute combined degeneration, D. Progressive spinal muscular atrophy
B: Amyotrophic latetal sclerosis
Answer: B: Amyotrophic latetal sclerosis 
Explanation: None