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Both RBC and WBC are formed in the
A. Thymus
B. Adrenal
C. Throid
D. Bone marrow

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Answer
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Hint: RBCs are red blood cells which are present in the blood and contain hemoglobin which helps in binding oxygen molecules and helps in transport of gases to and from the cells of the body. WBCs are White blood cells which help in fighting against foreign particles in our body and also maintain and provide immunity to the body.

Complete answer:
RBCs and WBCs both are the components of the blood fluid present in the body. These cells are produced by hematopoiesis along with other components of bloods which are blood platelets and blood plasma. RBCs help in transportation of oxygen to various parts of the body and carry carbon dioxide from the body to expel it.
WBCs are the cells which provide the immunity to the body by protecting our body from various foreign agents like microbes which can affect the body harmfully. These cells help in building a strong immune system so that the body can fight against microbes and protect from various infections and diseases. Both WBCs and RBCs are derived from a multipotent cell in the bone marrow which is known as hematopoietic stem cell.

Hence, the correct option is D. Bone marrow.

Note: Bone marrow consists of spongy tissue which is present inside our bones such as hip and thigh bones. This bone marrow contains stem cells which later on develop into red blood cells and white blood cells. Bone marrow is an essential part of the human body.