Which gland is known as the "master gland" of the body?

The following diagram shows the pituitary gland and its relationship with the hypothalamus. Identify $P, Q,$ and $R$.

Which of the following secretes luteinizing hormone?

$A$ patient complains of constant thirst,excessive passing of urine,and low blood pressure. When the doctor checked the patient's blood glucose and blood insulin levels,the levels were normal or slightly low. The doctor diagnosed the condition as diabetes insipidus. However,the doctor decided to measure one more hormone in the patient's blood. Which hormone does the doctor intend to measure?

Which of the following statements related to the pituitary gland are correct?
$(a)$ It is divided anatomically into adenohypophysis and neurohypophysis
$(b)$ It secretes follicle stimulating hormone
$(c)$ It secretes melanocyte stimulating hormone
$(d)$ It does not secrete prolactin
Choose the correct answer from the options given below:

Which of the following statements is correct regarding the Melanocyte Stimulating Hormone $(MSH)$?