The byproduct chondroitin sulphate is obtained from:

Correct option is A

Chondroitin sulphate is a sulfated glycosaminoglycan abundant in cartilage; shark cartilage (including bones) is a major commercial source.
Chemical role: provides structural support and shock absorption in cartilage.
Extraction: cartilage collection → enzymatic / chemical extraction → purification → drying.
Typical formulations: chondroitin alone or combined with glucosamine for joint supplements.
Uses / Applications
Nutraceuticals for osteoarthritis and joint health; marketed to reduce pain and improve mobility.
Also used in biomedical research and some cosmetic formulations.
Notes on other options
Shrimp heads: source of astaxanthin and chitin.
Shark scales/fins: contain collagen but cartilage is primary chondroitin source.