This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special Senses, Subject name: Physiology
Which taste sensation is the most sensitive (i.e., has the lowest stimulation threshold)? 
Select and explain. 
A. Acid, B. Bitter, C. Salty, D. Sour
B: Bitter
Answer: B: Bitter 
Explanation: The bitter taste sense is much more sensitive than the other sensations because it provides an impoant protective function against many dangerous toxins in food.