Fact 1: Pressure receptors are found mainly in the skin. Fact 2: Pacinian corpuscles are pressure receptors. Given the two facts above, pacinian corpuscles are found mainly in the _.?

1). tumor; 2). pupils; 3). muscle; 4). hair; 5). skin; 6). Man; 7). retina; 8). Summer;
The answer is:
5).