input: Write a function to construct a python dictionary containing student names and marks as key-value pairs. The function should take a list of tuples where each tuple contains a student name and their corresponding mark. The function should return the constructed dictionary.
  
  assert construct_student_marks([("John", 90), ("Levi", 85), ("Jill", 95), ("Sara", 75)])=={"John" : 90, "Levi" : 85, "Jill" : 95, "Sara" : 75}
  assert construct_student_marks([("Mike", 88), ("Amy", 70)])=={"Mike" : 88, "Amy" : 70}
  assert construct_student_marks([])=={}
output: def construct_student_marks(student_marks):
      return {name: mark for name, mark in student_marks}