The correct option is A Heart, blood, bones, notochord
Different tissues, organs and organ systems present in our body are derived from one of the three germ layers- ectoderm, endoderm, and mesoderm. These layers are formed after the blastula undergoes a process called gastrulation, to give rise to a structure called gastrula.
The heart is the organ that pumps oxygenated blood to all parts of the body, and collects deoxygenated blood from all parts of the body via blood vessels. Blood is the fluid connective tissue that helps in the transport of various substances in our body. Bones are specialized connective tissues that form the endoskeleton of our body. Notochord is a cartilaginous, rod-like structure found during the developmental stages of an embryo. It is a characteristic feature of chordates. The heart, blood, bones, and notochord are all derived from the mesoderm.
Muscles found in our body help in the movement of body parts. They are of three types- skeletal muscles, smooth muscles, and cardiac muscles. Muscles are derived from mesoderm, but the muscles of iris are derived from ectoderm.
Enamel is the hardest part of the human body. It covers the crown (exposed part) of the teeth. Cornea is the perfectly transparent, avascular layer of the eye which allows the free entry of light. Enamel and cornea are of ectodermal origin.
Liver is the largest internal gland of the body, located in the upper right side of the abdominal cavity. It is involved in many functions like phagocytosis, deamination, detoxification, haematopoiesis, carbohydrate metabolism, etc. It is derived from the endoderm.