Answer: C) Gamma Explanation: Cobalt therapy or cobalt-60 therapy is the medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer.   Cobalt 60 is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. It is produced artificially in nuclear reactors.

(D) Kwashiorkor

Kwashiorkor is a disease caused by the deficiency of protein in the diet. It is a form of malnutrition that particularly affects children in regions where there is a lack of access to an adequate protein source. Symptoms of kwashiorkor include edema (swelling), stunted growth, and changes in skin and hair. The other options listed—Hypokalemia, Dermatosis, and Goitre—are not specifically caused by a deficiency of protein. Hypokalemia is a low potassium level, dermatosis refers to various skin disorders, and goitre is often associated with iodine deficiency leading to thyroid gland enlargement.

1. The oldest evidence of plowing the fields has been found from Kalibanga.

2. It is situated on the banks of Ghaggar (Saraswati) river in Hanumangarh district of northern Rajasthan.

3. Kalibanga was excavated in 1960 by B.B. Lal and B.K. Thapar had started it.

4. Evidence of farming is found from Kalibanga, which is the oldest in the world.

5. Evidence of fire altars are found in a row on a raised platform made of raw bricks.

6. It was first discovered by Amla Nand Ghosh in 1952. B. K Thapar and B. B Lal did excavation work here in 1961-69.