Match the autoimmune diseases in Group I with the corresponding primarily affected organ in Group II.

Group I	Group II
P. Hashimoto's disease	1. Brain
Q. Juvenile diabetes	2. Pancreas
R. Multiple sclerosis	3. Skeletal muscle
S. Myasthenia gravis	4. Thyroid

A. P-1, Q-2, R-3, S-4

B. P-3, Q-1, R-2, S-4

C. P-4, Q-2, R-1, S-3

D. P-1, Q-2, R-4, S-3

Answer: Option C