Match List I with List II and select the correct answer using the codes given below the lists.
List I (Substance) List II (Physiological role)
A. Ptyalin 1. Converts angiotensinogen in blood into angiotensin
B. Pepsin 2. Digests starch
C. Rennin 3. digests proteins
D. Oxytocin 4. Hydrolyses fats
5. Induces contraction of smooth muscles
Option: (a)