Match List-I with List-II and select the correct answer:

List-I	List-II
a. Stethoscope	1. To measure intensity of light
b. Sphygmomanometer	2. To check purity of gold
c. Caratometer	3. To hear heart sound
d. Lux meter	4. To measure blood pressure

A. a-1, b-2, c-3, d-4

B. a-4, b-3, c-2, d-1

C. a-3, b-4, c-2, d-1

D. a-2, b-1, c-4, d-3

Answer: Option C