Q. With reference to the scientific progress of ancient India which of the statements given below are correct?
1. Different kinds of specialised surgical instruments were in common use by 1stcentury AD.
2. Transplant of internal organs in the human body had begun by the beginning of 3rdcentury AD.
3. The concept of sine of an angle was known in 5thcentury AD.
4. The concept of cyclic quadrilateral was known in 7thcentury AD.
Select the correct answer using the codes given below.