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: Physiology
According to Weber-Fechner's law, strength of stimulus perceived is directly propoional to: 
Select and explain. 
A. Intensity of stimulus, B. Amplitude of action potential, C. Number of neurons stimulated, D. Number of receptors stimulated
A: Intensity of stimulus
Answer: A: Intensity of stimulus 
Explanation: Ans: A. Intensity of stimulus(Ref: Guyton 13/e p615)According to Weber-Fechner's Law, strength of stimulus perceived is directly propoional to intensity of stimulus."Weber-Fechner Principle--Detection of "Ratio" of Stimulus Strength: In the mid 1800s, Weber first and Fechner later proposed the principle that gradations of stimulus strength are discriminated approximately in propoion to the logarithm of stimulus strength.