The part of human eye which controls the amount of light entering into it is:
Step 1: Identifying the structure. The iris is the part of the human eye that controls the size of the pupil and, in turn, regulates the amount of light entering the eye.
Step 2: Conclusion. Thus, the correct answer is option (A): Iris.
The strain-stress plot for materials A, B, C and D is shown in the figure. Which material has the largest Young's modulus? 
Read the following sources of loan carefully and choose the correct option related to formal sources of credit:
(i) Commercial Bank
(ii) Landlords
(iii) Government
(iv) Money Lende